Cataract in dogs: telling it from nuclear sclerosis, the diabetes link, surgery outcomes and what it costs in India

Signs of Cataract

The 8 signs to watch for are listed below. Any one of them is a reason to consult your nearby vet; none of them is a diagnosis.

• A white or grey cloudiness in the centre of the eye
• Bumping into furniture, worse in an unfamiliar room
• Hesitating at stairs or in dim light
• Trouble finding the food and water bowls
• Both eyes clouding within weeks in a diabetic dog
• Missing a thrown ball it used to catch easily
• Staying unusually close to you outdoors
• Redness, squinting, weeping or rubbing at the eye

Breeds on this site that document this condition

Each breed page below carries the figure for this condition with its denominator and its source. The 10 breeds listed are the ones on this site that document it, not a ranking of risk.

What a cataract in dogs is, and the bluish haze that is not one

A cataract in dogs is any opacity of the lens, the clear disc sitting behind the pupil that focuses light onto the retina. The opacity may be confined to a small area of the lens or affect the whole structure, and a complete cataract in both eyes results in blindness, while small non-progressive cataracts do not interfere with vision at all.

Most owners arrive at this page because an older dog's eyes have turned hazy, and for most of those dogs the answer is that it is not a cataract. As a dog ages, a bluish haze develops deep in the eyes behind the pupils, and if the dog can still see, that haze is usually a common, normal ageing change called lenticular sclerosis or nuclear sclerosis, in which the lens fibres become compressed and translucent rather than opaque. Cornell's own page puts the consequence plainly, that lenticular sclerosis will not make dogs blind and affected dogs may simply not see fine details as they once did.

The honest version of that correction carries a caveat almost nobody prints. When 229 eyes from 118 companion dogs free of other eye disease were graded for nuclear sclerosis from 0 to 3 and then refracted, the proportion of eyes with more than 1.5 dioptres of myopia climbed with the grade: 4 of 58 eyes (6.9 percent) at grade 0, 12 of 91 (13.2 percent) at grade 1, 13 of 57 (22.8 percent) at grade 2 and 7 of 23 (30.4 percent) at grade 3. The authors' conclusion is worth quoting for its restraint, that nuclear sclerosis is associated with visual deficits in some dogs but is only weakly associated with myopia. So nuclear sclerosis is not a cataract and needs no treatment, and it is also not quite nothing.

How common cataracts actually are, with the denominators

Two studies give real numbers, and they measure different things. A cross-sectional study examined 2,000 dogs ophthalmoscopically, drawn from veterinary hospitals, a pet nutrition centre, rehoming charities and breeding kennels, and fitted a prevalence curve by year cohort. The age at which half of all dogs had cataract came out at 9.4 years, plus or minus 3.3 years, and every dog over 13.5 years in that study was affected by some degree of lens opacity. That last figure is the one to hold alongside the nuclear sclerosis correction: an old dog's haze is usually sclerosis, and by 13.5 years some lens opacity is universal.

The second study counted hospital caseloads instead. Every dog presented with cataract to veterinary medical teaching hospitals across North America between 1964 and 2003 was reviewed, a total of 39,229 cataractous dogs over the 40 years. Prevalence by decade ran 0.95 percent for 1964 to 1973, 1.88 percent for 1974 to 1983, 3.5 percent for 1984 to 1993 and 2.42 percent for 1994 to 2003, an increase of about 255 percent across the period. Fifty-nine breeds sat above the baseline prevalence of 1.61 percent measured in mixed-breed and hybrid dogs, and in that same baseline population cataract affected 16.80 percent of dogs aged 7 to 15 and over. A teaching-hospital caseload is not a national prevalence, and an Indian referral clinic would be no different.

The causes of cataract in dogs fall into a short list, and the list matters because it decides what happens next. Cornell names genetic inheritance, metabolic disturbance from diabetes, trauma, nutritional imbalance in orphan pups raised on milk replacer, and chronic uveitis. Vet Times adds trauma that penetrates the lens capsule, such as a cat claw or a thorn, which lets water into the lens and is often accompanied by an aggressive phacoclastic uveitis, plus toxic cataracts, which are rare in dogs, and radiation exposure during radiotherapy. A hereditary cataract is a different animal from a diabetic one, and each has its own section below.

One link is easy to miss and it points at a sibling disease. Primary cataracts occur in some breeds, while in other breeds the cataract develops secondarily to another inherited disorder such as progressive retinal atrophy or glaucoma. That matters before anyone books surgery, because removing the lens from an eye whose retina is already dying restores nothing.

The stages of cataract development, and why the stage decides everything

The stages of cataract development are named for how much of the lens is involved, and the stage a dog is at decides whether surgery is straightforward, risky or off the table. Classification by maturity is the one most widely used, because it tracks the extent of visual impairment and the prognosis for successful cataract surgery.

Four named stages and one further extreme cover the whole course. An incipient cataract is an early focal opacity, generally involving less than 15 percent of the lens volume, with no discernible effect on vision. An immature cataract affects between 15 and 100 percent of the lens, and its characteristic feature is that a tapetal reflection is still present despite the opacity, so the animal remains visual with vision impaired. A mature cataract is opacity of the whole lens with no tapetal reflection, the fundus cannot be examined and the animal is functionally blind. A hypermature cataract is what an untreated mature cataract becomes, as the lens proteins begin to liquefy, leak out of the capsule and let the lens shrink, leaving the capsule wrinkled or irregular.

A Morgagnian cataract is the end of that road, an advanced hypermature cataract in which the lens cortex has completely liquefied, leaving the nucleus to sink ventrally inside the capsule while the anterior chamber deepens as the lens shrinks. By then the surgical question has usually been answered for the owner rather than by them.

Why waiting costs the dog its surgical options

The timing advice from both an ophthalmologist and a clinical review says the same thing in different words. Cornell's Dr Kelly Knickelbein states that the ideal time to operate is before the cataract becomes mature, because more advanced mature and hypermature cataracts are more likely to cause lens-induced intraocular inflammation, lens instability and loss of lens capsule integrity. Those complications may preclude surgery from being performed at all, may lead to a poorer prognosis for vision and comfort afterwards, and may prevent placement of a synthetic intraocular lens. Vet Times reaches it from the outcome side, that the success rate is higher for surgical removal of immature or mature cataracts than for hypermature ones, so early referral is ideal. When a general practice vet refers a dog on to a veterinary ophthalmologist, the stage the eye is at on that day is what the surgeon has to work with.

The register data agrees. In a series of 172 dogs and 290 eyes followed for up to four years after surgery, eyes with hypermature cataracts were more likely to develop glaucoma afterwards. Waiting does not preserve a choice, it removes one.

There is one honest counterweight. If a cataract is not significantly impairing vision, close monitoring for progression and for signs of uveitis is what is recommended rather than immediate surgery. An incipient opacity spotted at a routine examination is a reason to book a recheck, not a reason to operate.

Diabetic cataracts in dogs, the fastest route from sight to blindness

Diabetic cataracts are the single commonest reason a dog goes blind quickly, and the proportion is high enough that any dog diagnosed with diabetes should be treated as a future cataract patient. In a retrospective cohort of 200 diabetic dogs followed at one teaching hospital between 1985 and 1995, half the population had developed cataracts by the 170th day after the diabetes diagnosis, 75 percent by 370 days and 80 percent by 470 days.

The mechanism explains the speed. Excess glucose in the lens is converted to sorbitol, a sugar alcohol that the lens cannot easily clear, and the osmotic effect of sorbitol draws water in, so the lens swells, the fibres are disrupted and oxidative stress follows Williams DL. Effect of oral alpha lipoic…. That swelling is not a metaphor and it has been measured. B-mode ultrasonography of 50 normal dogs and 100 dogs with cataract found the axial lens thickness in diabetics at 8.4 mm plus or minus 0.9, against 6.7 mm plus or minus 1.0 in normal eyes, 6.4 mm in immature cataract and 7.4 mm in mature cataract. The anterior chamber was correspondingly shallower in diabetic cataract, 2.9 mm plus or minus 0.1 against 3.8 mm plus or minus 0.1 in normal eyes.

Sources quote the headline proportion four different ways, and the differences are worth seeing rather than smoothing over.

Read the primary cohort and the drift becomes obvious. Beam's 80 percent figure sits at 470 days, which is nearer 16 months than 12, so Cornell's compression of the whole thing into the first year is generous at the top end and the Vet Times figure is the one that matches the study Cornell University College of Veterinary…. The arithmetic of the cohort is also worth stating because no ranking page does: of the 200 dogs, 23 already had cataracts at the diabetes diagnosis, 132 of the remaining 177 developed one, 23 had none at their last examination and 22 were lost to follow-up. The sentence the study itself ends on is that the majority of diabetic dogs develop cataracts within five to six months of diagnosis.

One line from Cornell deserves its own sentence because owners routinely assume the opposite. The cataracts form regardless of how well controlled the diabetes is. Good glycaemic control is worth having for every other reason, and it is not a defence against this.

Why a diabetic cataract is an eye emergency in slow motion

A lens that swells fast can split its own capsule. In a retrospective series from Ohio State of dogs with diabetes and cataract, 30 of 40 affected eyes had a spontaneous rupture of the lens capsule before surgery, diagnosed on clinical examination in 28 of those 30 and found during surgery in the other two. The dogs had been diabetic for a mean of 123 days and their cataracts had been visible for a mean of 39 days. Cornell describes the same cascade in clinical terms, that diabetic cataracts form quickly and frequently cause severe lens-induced uveitis, which can result in glaucoma, that glaucoma is notoriously difficult to manage in these patients, and that many such dogs need the eye removed.

The treatment comparison in diabetic dogs specifically is the starkest number on this page. Across 150 eyes in 76 dogs with diabetic cataract, 58 eyes in 31 dogs had phacoemulsification and 92 eyes in 48 dogs were managed with an ophthalmic solution alone; at the last follow-up 94.8 percent of the surgical group had vision, against 7.6 percent of the medication group that regained any visual axis. The same study found no difference in complication risk between the surgical group and the owner-led medication group, and a higher complication risk in the group where the veterinarian had advised against surgery. At one year the surgical dogs were on an average of 1.7 ophthalmic solutions and the medicated dogs on 2.6.

Anaesthesia is where a diabetic dog is genuinely different, and an owner should hear it before the day. Comparing 66 diabetic and 64 non-diabetic dogs anaesthetised for phacoemulsification, the diabetic dogs were more likely to develop moderate and severe intraoperative low blood pressure, and 44 percent of the diabetic dogs had at least one episode of severe high blood glucose while anaesthetised. That is a reason to have the diabetes stabilised and the anaesthetic planned, not a reason to avoid the operation. Our page on diabetes in dogs and cats covers the disease itself.

What an untreated cataract does to the rest of the eye

An untreated cataract does not sit still, and the damage it causes is what makes it worth treating rather than watching. The largest register available shows that nearly 20 percent of all cataractous dogs developed secondary glaucoma in at least one eye, and that glaucoma associated with cataract formation accounted for 81 percent of all canine secondary glaucomas.

Those figures come out of the Veterinary Medical Data Base covering every North American veterinary teaching hospital from March 1964 to March 2003, in which 1,592,831 dogs were presented and 9,695 canine secondary glaucomas recorded. Within the breeds predisposed to both, a group of 7,890 dogs, the overall prevalence of secondary glaucoma was 0.5 percent. The other routes to secondary glaucoma were far less common: lens luxation or displacement in 779 dogs, 12.0 percent, glaucoma following cataract surgery in 528 dogs, 5.1 percent, and uveitis of unknown cause in 399 dogs, 7.1 percent.

The breeds carrying that risk between 1994 and 2003 are ones Indian owners recognise, and the list includes the American Cocker Spaniel, the Boston Terrier, the Toy, Miniature and Standard Poodle, the English Springer Spaniel, the Bichon Frise and the Labrador Retriever Gelatt KN, MacKay EO. Secondary glaucomas…. Four things go wrong, in a recognisable order.

1. Lens-induced uveitis, as leaking lens protein inflames the inside of the eye, which is painful and is treated.
2. Glaucoma, meaning a rise in pressure inside the eye, which follows the inflammation and is notoriously hard to manage once it starts.
3. Lens luxation, in which the shrinking, unstable lens slips out of position.
4. Retinal detachment, which blinds the eye whatever happens to the lens afterwards.

The end point of that sequence is the reason vets push for early referral. Chronic cataracts can cause excruciatingly painful, unmanageable secondary problems inside the eye for which the only recourse is enucleation, the surgical removal of the eye. An eye that has been left alone for two years is often no longer a candidate for anything except removal.

How much worse is doing nothing, in numbers

One Canadian series measured exactly that and its numbers are severe. Across 77 cataractous eyes in 44 dogs followed for a median of 2.3 years, split between no treatment, topical medication alone and phacoemulsification with an intraocular lens, failure occurred in every single untreated eye, and the failure rate in untreated eyes was 65 times that of medically treated eyes and 255 times that of surgically treated eyes. Medical treatment alone still carried four times the failure rate of surgery.

A second study reached a materially different conclusion and this page publishes both. Comparing 72 eyes in 41 dogs managed without surgery against 126 eyes in 67 dogs that had phacoemulsification, the complication rates were 15 of 72 eyes, 20.8 percent, without surgery and 23 of 126 eyes, 18.3 percent, with it, a difference that was not statistically significant. The two studies are not measuring the same thing. The Canadian study counted failure, while the American one defined success in a non-surgical eye as a comfortable eye with no potentially painful complications and did not require that the eye could see, so an eye that went comfortably blind counted as a success Lim CC, Bakker SC, Waldner CL.

The American study also found the finding that most changes what an owner should ask. Complication rates were significantly higher in the group where the ophthalmologist had advised against surgery than in the group where the owner had declined it, and higher than in the surgical group. In other words, eyes that a specialist judges unsuitable for surgery do badly because they were already bad eyes, not because surgery was withheld. A dog declined for surgery needs monitoring, not reassurance.

How a cataract in dogs is diagnosed, and what has to be checked before surgery

To diagnose a cataract in dogs, a veterinarian examines the lens after dilating the pupil and looks for whether a tapetal reflection still passes through it, which separates an immature cataract from a mature one and separates both from nuclear sclerosis. That examination answers what the opacity is. It does not answer whether surgery will restore sight, and two further tests do.

The two pre-surgical tests are the ones that decide the whole question. Cornell lists an ocular ultrasound to rule out retinal detachment and an electroretinogram to demonstrate appropriate retinal function, alongside a pre-anaesthetic evaluation, as part of the admission for cataract surgery. Vet Times adds that the ultrasound is also looking for other abnormalities of the posterior segment that could influence success, naming persistent fetal vasculature and extensive vitreal degeneration, and that any lens-induced uveitis should be controlled before surgery to reduce postoperative complications.

The reason is blunt and it is the sentence an owner should carry into the consultation. If the retinas are not healthy, the dog will still be blind, or will become blind, even with surgery. A dog whose cataract sits on top of progressive retinal atrophy gains nothing from having the lens removed, and an electroretinogram is how that is found out beforehand rather than afterwards.

Ultrasound also does measuring work, not only ruling out. The lens thickness and anterior chamber figures quoted earlier on this page were obtained by B-mode ultrasonography used as a routine pre-phacoemulsification screening procedure in 100 dogs with cataract. The scan that clears the retina is the same scan that sizes the lens.

A full work-up runs to five steps, and an Indian owner should expect all five at a centre that operates.

1. A dilated examination of both eyes, to stage the cataract and check whether a tapetal reflection remains.
2. Slit-lamp biomicroscopy and tonometry, the standard eye examination a veterinary ophthalmology service runs, alongside fundoscopy and a tear test.
3. Ocular ultrasound, to rule out retinal detachment and other posterior-segment disease before anyone books theatre.
4. An electroretinogram, which tests whether the retina still responds to light behind an opaque lens.
5. A pre-anaesthetic work-up, which in a diabetic dog is not a formality given the anaesthetic complication rates measured in 66 diabetic dogs Cornell University College of Veterinary….

What the examination cannot be replaced by

No photograph settles this, and that is worth saying because owners increasingly arrive with one. The difference between a cataract and nuclear sclerosis is the difference between light being blocked and light being scattered, and it is judged by whether the fundus can still be seen through the lens with an ophthalmoscope Cornell University College of Veterinary…. A phone photograph of a hazy eye shows the haze and nothing about what light is doing behind it. An examination costs a consultation fee; a wrong guess in either direction costs either an unnecessary surgical work-up or a year of a treatable eye.

Cataract surgery in dogs, and what the outcome figures actually say

Cataract surgery in dogs is phacoemulsification, in which small incisions are made in the cornea and the lens capsule, high-frequency vibration pulverises the lens, the fragments are removed by vacuum, an artificial lens is inserted and the cornea is sutured closed. For ideal surgical candidates the success rate has been reported as high as 80 to 90 percent, and in general the sooner the surgery is done the better the outcome.

Two large series put numbers behind that range. At Purdue, 103 dogs and 179 eyes operated between 2006 and 2008 were reviewed, and at the final recheck 148 eyes, 82.7 percent, were functionally visual, while 18 eyes, 10.0 percent, were blind and 13, 7.3 percent, had reduced vision. The commonest postoperative complications in that series were ocular hypertension in 22.9 percent of eyes, corneal lipid opacity in 19.0 percent, uveitis in 16.2 percent, intraocular haemorrhage in 12.3 percent, retinal detachment in 8.4 percent and glaucoma in 6.7 percent.

A longer follow-up shows why the timescale matters. In 172 dogs and 290 eyes followed from 1995 to 2002 in bands out past four years, the prevalence of glaucoma rose with time but stayed below 10 percent until after the one-year mark, and the prevalence of failure, meaning blindness, enucleation or evisceration, stayed below 10 percent until after the three-year mark. Retinal detachment was uncommon at 1 to 2 percent across every time band. Boston Terriers, Cocker Spaniels, Cocker Spaniel and Poodle crosses and Shih Tzus carried an increased risk of developing glaucoma after surgery.

The complication nobody warns owners about is the one that happens to everybody. Posterior capsular opacification is the commonest postoperative complication of modern cataract surgery, and in a prospective study of 265 eyes, 144 from diabetic dogs and 121 from dogs with breed-related cataracts, all eyes from all dogs developed it in a time-dependent manner. Small and medium breeds developed significant opacification earlier than large and giant breeds at two weeks and at two to four months, though the difference washed out later, and age, sex, inflammation and the cause of the cataract made no difference to it.

What the operation involves, day to day

The hospital stay is longer than most owners expect and the aftercare is the hard part. Dogs undergoing cataract surgery generally spend three to four days in hospital, covering the initial examination, the pre-surgical diagnostics, the pre-anaesthetic evaluation, anaesthesia and surgery, and close postoperative monitoring. After discharge, at-home care involves topical medication given four to six times daily, several oral medications, a hard plastic collar and activity restriction, with frequent follow-up examinations early on, and patients generally require at least one topical medication and routine examinations for life.

Whether one eye or both are operated is a clinical decision rather than a budget one. Because cataract surgery in dogs requires general anaesthesia, if both eyes have cataracts and both are candidates, both are often operated as one procedure, while some dogs have only one eye that is a candidate despite bilateral cataracts and some cataracts are asymmetrical enough that only one eye is indicated.

India has a published record of this operation being performed here, which the search results do not surface. Ten clinically healthy mixed-breed dogs had unilateral cataract removal by phacoemulsification with the phaco-chop technique and an intraocular lens placed, at the Department of Veterinary Surgery and Radiology, West Bengal University of Animal and Fishery Sciences in Kolkata, and the surgery was completed in every dog without major intraoperative or anaesthetic complications. This page quotes no anaesthetic quantity from that work, because dosing is the decision of the veterinarian in front of the animal.

Cataract eye drops for dogs, and what the evidence actually supports

No topical product has been shown to dissolve or reverse an established cataract in dogs, and the Indian clinic page that ranks first for the surgery cost query says the same thing in one line, that there are no medications that can reverse cataracts. The one veterinary trial of the ingredient most often sold for it measured a change of about 2 percent, and the reason that number is not a cure is that it is a 2 percent change.

The trial is worth reading in detail, because it is the source almost every marketing claim traces back to. Thirty dogs of varying breeds and ages, with 58 eyes carrying a spectrum of lens opacities, were treated with a topical antioxidant formulation containing N-acetyl carnosine and examined at 2, 4 and 8 weeks, with lens opacity measured by a computed lens opacification index from retroillumination photographs. The 58 eyes broke down as 22 with mature cataract, 13 with immature cataract, 9 with cataract alongside other intraocular disease such as uveitis, and 14 with nuclear sclerosis alone.

The results separate cleanly along the stages this page has already set out. The mean reduction in opacity across all cataracts was 2.3 percent plus or minus 0.33, and it reached statistical significance only in the eyes with immature cataract, at 4.5 percent, and in the eyes with nuclear sclerosis alone, at 5 percent. In eyes with mature cataract the change was 0.5 percent plus or minus 0.4 and in eyes with cataract alongside intraocular inflammation it was 1.3 percent, and neither was statistically significant. So the product moved the needle slightly in the eyes that were barely affected and did essentially nothing in the eyes that were blind.

One oral agent has a more interesting preliminary result, and it is about prevention rather than reversal. Alpha lipoic acid inhibits aldose reductase, the enzyme that turns lens glucose into the sorbitol that draws water in, so blocking it should prevent diabetic cataracts from forming in the first place. In a comparison of diabetic dogs given oral alpha lipoic acid against those given a conventional antioxidant mix of ascorbic acid and tocopherol, the alpha lipoic acid dogs developed significantly fewer lens opacities, and the cataracts that did form appeared significantly later after treatment began. The author calls it a small study conducted over a short period and says plainly that the result is a reason to evaluate the effect in larger trials.

That is the whole honest position on medication. Nothing sold as a topical product cures an established cataract Williams DL, Munday P. The effect…, one nutraceutical has a small preliminary signal for delaying diabetic cataracts, and there is a separate and better-established role for prescribed topical anti-inflammatory treatment, which is not aimed at the lens at all.

The drops that do have a job

Anti-inflammatory eye medication is prescribed to protect the eye from the cataract rather than to clear it. Cornell's advice for a dog that is not a surgical candidate is to talk to the veterinarian about topical anti-inflammatory therapy to try to prevent cataract-associated ocular disease, and to have the dog's ocular pressures checked for glaucoma every four to six months. The Saskatchewan series supports the same fallback with a number, since medically treated eyes failed at four times the rate of surgical ones but at a fraction of the rate of untreated eyes, and it concludes that where referral is not possible, topical anti-inflammatory therapy is what to do instead.

This page names no drug and prints no dose anywhere, and that is deliberate. Which anti-inflammatory, at what strength, how often and for how long are decisions for the veterinarian who has looked into your dog's eyes and measured its pressures, and a number on a reference page is the number an owner will use.

What cataract surgery costs in India, from a government rate card and a private range

The surgery cost in India splits into two completely different numbers because they are two different operations. A government veterinary institute prints a cataract surgery line of Rs 600 for a pet animal, plus tax as applicable, on a rate card effective from June 2024, while the Indian clinic chain that ranks first for this query quotes Rs 30,000 to Rs 80,000 per eye for private phacoemulsification with an artificial lens.

The government figure comes from the Referral Veterinary Polyclinic rate card published by ICAR-Indian Veterinary Research Institute at Izatnagar, under the heading 'Charges for surgical procedures and diagnostic imaging services (w.e.f. June 2024)', with columns for pet, small and large animals and the footnote 'Plus tax as applicable';. Cataract surgery sits at entry 28 on that card at Rs 600.00 for a pet animal, next to enucleation of the eye at Rs 400.00, cherry eye at Rs 500.00 and entropion or ectropion at Rs 250.00. The same page prices registration for a dog or cat at Rs 30.00 at normal hours, rising to Rs 200.00 after 12:30 pm and Rs 400.00 after 5:00 pm or on holidays, with ultrasonography at Rs 250.00 and a complete blood count at Rs 300.00.

Every rupee figure above was divided by 84.38 and by 74 before it was published here, and none of them lands on a round dollar amount. Vetic prints its own range with the rupee glyph, as ₹30,000 to ₹80,000 per eye, and it is reported here in the same figures. Rs 600 is USD 7.11 at 84.38 and USD 8.11 at 74, Rs 3,500 is USD 41.48 and USD 47.30, and the Rs 30,000 to Rs 80,000 range is USD 355.53 to USD 948.09 at 84.38, so none of these is a converted dollar list being passed off as an Indian price.

Why the two Indian prices are 50 times apart

They are not the same operation and that is the whole explanation. The 2015 Kochi report describes manual extracapsular cataract surgery, in which an incision is made in the corneal limbal region, the affected lens is removed and the incision is closed, performed by Dr N N Sunil, senior veterinary surgeon at the district veterinary centre in Ernakulam. His own description of the outcome is the key line, that the dog can still see without the lens. That is vision without focus, not the focused vision an intraocular lens restores. Phacoemulsification with an implanted lens is a microsurgical procedure needing an operating microscope and equipment usually only available in a referral setting, which is what the private range is buying.

The Kochi report is also the closest thing to an Indian caseload figure anyone has published. Asked how common this is, the surgeon said that one or two in a hundred dogs will surely have an eye disease and that the numbers could be more, adding that eye disease in dogs is usually diagnosed at a late stage and that not many owners are aware of the surgical options. Similar cataract surgeries had been performed on Labradors, mongrels and German shepherds at that centre over the preceding two years.

Availability, not price, is the real Indian constraint, and the top-ranking Indian page says so about itself. Vetic's own article states that surgery for cataract in dogs is rare in India and advises the reader to ask their veterinarian which clinics and hospitals in their area perform it. Named centres do exist. The Eye Vet, founded by Dr Kasturi Bhadsavle MVSc, runs veterinary ophthalmology clinics listed at addresses in Maharashtra, at Chembur in Mumbai and Pimpri-Chinchwad in Pune, in Haryana at Gurugram and in Telangana at Jubilee Hills in Hyderabad, with a further contact line for Bengaluru in Karnataka, offering intraocular surgery including cataract removal and luxated lens removal alongside slit-lamp biomicroscopy, tonometry, fundoscopy and tear testing. The practice publishes no price list, so an Indian owner gets a figure at the consultation and not before it. An owner in Chennai, Ahmedabad or Kolkata is travelling to reach one of those five cities, and the journey with a dog is part of what the surgery really costs.

One more Indian centre has published rather than advertised. The phacoemulsification series from West Bengal University of Animal and Fishery Sciences in Kolkata is the only Indian canine cataract surgery record this page found on PubMed, and it confirms that the full procedure, including an intraocular lens, has been performed and written up in India. What none of these sources gives is a published Indian success rate, so the outcome figures on this page remain North American, British and Korean ones. An owner should ask the centre for its own numbers.

Hereditary cataract, the HSF4 DNA test and the four breeds it covers

Hereditary cataract has one DNA test in routine use, and it checks a single gene in four named breeds. Mutations in HSF4 have been shown to cause hereditary cataract in the Australian Shepherd, Boston Terrier, French Bulldog and Staffordshire Bull Terrier, and a dog outside that list is not covered by the test at all.

The gene was found by screening 20 genes already known to cause cataract in humans, and what came back was not one mutation but several in the same gene, behaving differently by breed. One HSF4 mutation causes bilateral cataracts in Staffordshire Bull Terriers, Boston Terriers and French Bulldogs, is autosomal recessive, so a dog needs two copies to be affected, and can be diagnosed as early as 8 to 12 weeks of age although it is not congenital. A slightly different mutation in the same gene is a risk factor for bilateral posterior polar subcapsular cataracts in the Australian Shepherd, where it behaves as an autosomal dominant, so one copy is enough to put a dog at risk. In affected dogs, obvious cataracts appear between 9 and 15 months of age, progress and mature between 2 and 4 years, and the Kennel Club describes the result as a blinding condition if left untreated.

The size of the effect in the Australian Shepherd has been measured. Using DNA from almost 400 privately owned Australian Shepherds, a dog carrying the mutation was found to be approximately 17 times more likely to develop binocular cataracts than a dog clear of it. Testing has since been taken up: among 233 Australian Shepherds tested in Italy between 2020 and 2024, the overall mutant allele frequency was 6.01 percent, and a smaller subset of 13 Miniature American Shepherds were all homozygous wild type.

Four published results show exactly how far a clear HSF4 certificate does not reach, and this is the discipline to carry into any conversation with a breeder.

1. A clear result does not clear a Boston Terrier. The HSF4 mutation causes early-onset hereditary cataract in the breed but not the late-onset form, tested across 22 dogs with early-onset disease and 40 that were clear or had the late-onset form, and the two forms are genetically discrete conditions.
2. A clear result does not clear an Australian Shepherd. A separate locus on canine chromosome 13 was found to be associated with cataract using 15 bilateral posterior polar cataract cases and 68 controls that were all clear of the HSF4 mutation.
3. The test is meaningless in most breeds. The mutation was absent from 24 Dachshunds and 20 Entlebucher Mountain dogs with primary cataract when exon 9 of HSF4 was sequenced in all of them.
4. Some breeds inherit it without a single gene at all. In 872 phenotyped Jack Russell Terriers, backed by a further 1,898 dogs for the pedigree, cataracts and primary lens luxation were highly heritable and genetically correlated, neither was controlled by a single gene, and the cataracts were not associated with an HSF4 mutation.

The scale of the gap is in the literature's own framing. Approximately 100 breeds are affected by primary hereditary forms of cataract, and to date only a single gene, HSF4, has been implicated in the disease in dogs. One gene, four breeds, roughly a hundred affected. A DNA test is a document about one variant, not a clearance for the eye.

The two registers, and why they are different sizes

A clinical eye examination and a DNA test are separate screens, and the register makes the gap visible. Reading the Orthopedic Foundation for Animals record for the Staffordshire Bull Terrier live on 24 September 2026, the eye register held 1,522 dogs examined, of which 1,478 were normal (97.1 percent) and 44 abnormal (2.9 percent), while the cataract DNA register held 538 dogs tested, of which 537 were clear (99.8 percent) and 1 was a carrier. Both rows were arithmetic-checked against their own totals before publication. The same page lists what the breed's health scheme asks for, which is a hip evaluation, an elbow evaluation, an eye examination by a board-certified ophthalmologist once the dog is 12 months old, an L-2-hydroxyglutaric aciduria DNA test and a hereditary cataract DNA test from an approved laboratory. Nearly three times as many dogs have had the eye examination as have had the DNA test, and a register snapshot moves, so date any figure taken from it.

The British clinical scheme prints its own price and volume. Under the British Veterinary Association Canine Health Schemes Eye Scheme, a routine eye examination for one dog starts from GBP 72.00 including VAT, litter screening for puppies aged 5 to 12 weeks starts from the same figure, and over 14,000 dogs had eye examinations in 2025. Results are recorded as Clinically Unaffected or Clinically Affected on a certificate issued at the appointment, and the scheme is open to pedigree and crossbreed dogs alike without requiring kennel club registration. India has no equivalent national eye scheme, so an Indian buyer is asking a breeder for private records rather than for a scheme certificate.

What Indian law says, and what it does not say

India's breeding rules name eleven genetic defects and cataract is not among them. Clause (10) of the Prevention of Cruelty to Animals (Dog Breeding and Marketing) Rules, 2017 reads that the dogs shall have been tested for genetic defects, including hip dysplasia, progressive retinal atrophy, night blindness, hypothyroidism, entropion, ectropion, overshot, undershot jaw (when incisors do not touch or mesh), wry mouth, two or more missing teeth, unilateral cryptorchid or full cryptorchid males. The word cataract does not appear anywhere in the 14-page gazette. That absence was checked on a whitespace-stripped copy of the whole document running to 39,080 letters, on which night blindness, genetic defects, progressive retinal atrophy, entropion, hypothyroidism, hip dysplasia and cryptorchid each returned a hit, so the extraction was sound and the absence is real rather than an artefact of the text layer.

Read the clause carefully before drawing the wrong conclusion from that. The word including makes the list illustrative rather than exhaustive, so a hereditary cataract test is unnamed by the rules rather than excluded by them. A breeder asked for one cannot point at the gazette and say it is not required of them, and equally the gazette gives a buyer no clause to quote. Our guides to checking a dog breeder in India and KCI registration explained cover what a Kennel Club of India certificate does and does not say about health testing, and what the rest of the paperwork proves.

The older dog, the surgery decision and living with a blind dog

Age alone does not rule a dog out of cataract surgery, and the honest answer to whether a 14-year-old can have it is that age raises the risk measurably rather than closing the door. In 179 operated eyes, the odds of blindness rose with each year of increasing age at an odds ratio of 2.00, and rose far more sharply in Boston Terriers compared with mixed-breed dogs.

Cornell sets out five reasons a surgeon declines, and only one of them is about the calendar. The risk against the benefit, which is where surgery in older dogs with heart or kidney disease sits; life expectancy, where a dog with very old age or terminal cancer is probably not a good candidate; the general health of the eye, since the corneas must be healthy and an unhealthy retina leaves the dog blind anyway; the owner's ability to commit to intense postoperative care around the clock; and the temperament of the dog, because some dogs are very challenging to medicate through an intensive protocol both in hospital and at home.

Two of those five are about the household rather than the dog, which is worth saying in an Indian context where a referral centre may be in another city. Postoperative care means topical medication four to six times daily plus oral medication, a hard collar, restricted activity and frequent rechecks, with at least one topical medication and routine examinations continuing for life. A family that cannot do that reliably is being told something real by its own honesty, not failing a test.

What an old dog's cloudy eye usually is

For most owners of a 14-year-old the surgical question turns out not to arise, because the haze is not what they think. The cross-sectional study of 2,000 dogs put the age at which half of all dogs carry some cataract at 9.4 years and found that every dog over 13.5 years had some degree of lens opacity, while the North American caseload found cataract in 16.80 percent of mixed-breed dogs aged 7 to 15 and over. A great deal of what an owner sees at that age is nuclear sclerosis, which will not make a dog blind. An eye examination separates the two in one appointment, and our guide to senior dog care in India covers the rest of the ageing checklist.

The distinction changes the decision completely. A 14-year-old with nuclear sclerosis needs no surgery and no medication. A 14-year-old with a mature cataract, a comfortable eye and normal pressures may reasonably be monitored with pressures checked every four to six months rather than operated. A 14-year-old with a painful eye needs a veterinarian today, whatever the decision about the lens turns out to be.

A last note for owners weighing a second eye or a second opinion. The comfortable-eye finding from Wisconsin cuts both ways, since an eye a specialist has declined carries a higher complication rate than an eye an owner declined, which means a dog turned down for surgery needs closer monitoring and not less. Ask what specifically ruled the eye out, whether it was the retina on the electroretinogram, the cornea, the pressures or the dog's general health, and ask when the eye should next be examined.