Dark Spots on the Eye Average Cost

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What is Dark Spots on the Eye?

Feline corneal sequestrum is a condition in which dead corneal tissue accumulates on and around the cornea resulting in the development of dark spots on the eye. These spots may vary in size and depth and range in color from opaque to dark black. The condition is most common in cats with light-colored eyes and is particularly common in the Persian, Himalayan, Burmese, and Siamese breeds. Feline iris melanoma is another potential cause. It occurs when abnormal pigmented cells invade and proliferate throughout the iris. These cells may be either benign or malignant (cancerous), but represent small tumors in either case. 

Many cats are born with, or grow to develop, very interesting eye coloring patterns that may incorporate dark spots. Most often, color variations are harmless genetic features that in some cases are seen to be quite desirable when selecting a pet. However, some dark spots on the eyes of your pet may be a sign of a serious issue.

Symptoms of Dark Spots on the Eye in Cats

Iris melanoma is characterized by small, freckle-like spots on the iris. There are usually very few additional symptoms. If an abnormal cell mass becomes raised, it can lead to inflammation and tearing. However, the melanoma is very rarely painful, unless tumor growth is extremely severe. 

Though corneal sequestra can be very painful, signs of ocular pain in your cat are usually very subtle. Sight is often not hindered substantially and in many cases; the pain experienced is more of an annoyance. However, there are signs that your pet may be developing an issue. These signs include:

  • Squinting
  • Tearing
  • Elevation of the third eyelid

Depending on the duration of the condition, these indicators will be accompanied by secondary inflammation which could also lead to infection.


Iris Melanoma

Iris melanoma is most often benign and represents little to no pain or discomfort for the cat. In these cases, the largest concern is an elevated risk for glaucoma. It is possible that the masses may transition to malignant, so continued evaluation is recommended. If malignant, the opportunity for metastasis, or spreading of the cancer, is quite high, given the amount of direct fluid contact with the bloodstream. 

Feline Corneal Sequestra

Feline corneal sequestra can be painful and, at a minimum, uncomfortable to your cat. It may not always significantly impact your pet's sight, but if left untreated, corneal sequestra can remain for years and have permanent detrimental effects. The collection of dead corneal tissue can be a target for infection as well. If you picture the corneal sequestrum as a scab of the eye, you can imagine the issues this condition could bring about. Some instances of corneal sequestra will cause the immune system to attack the surrounding healthy tissues and spread the development of the dead tissue mass. 

If untreated, this mass can potentially separate from the surrounding eye tissue and ultimately lead to eye rupture. Depending on the severity, this outcome may not be repairable, thus leading to potential surgical eye removal. The best treatment option for eliminating this condition is early detection and surgical removal of the sequestrum.

Causes of Dark Spots on the Eye in Cats

The cause of iris melanoma is not known. As with most other tumors, there are genetic markers to indicate predisposition, but no defined source exists. 

The true cause of feline corneal sequestra is also unknown. The condition is not known to be linked to any chronic diseases or conditions. However, it is commonly linked to any one or more of the following:

  • Eye trauma
  • Dry-eye syndrome
  • Abnormal eyelid conformation
  • Feline herpesvirus infection

It is also a common belief that genetics play a factor in the development of corneal sequestra. The occurance rate among certain breeds supports this theory. It is also commonly linked to specific feline features, such as lighter eye color and eyelid conformation. However, with all that is still unknown regarding the causes of the condition, it is most widely accepted that propensity for development of corneal sequestra is dependant on the individual cat. 

Diagnosis of Dark Spots on the Eye in Cats

In the case of iris melanoma, a micro-needle biopsy can be performed to determine the nature of the tumors. This procedure is very delicate and should only be performed by a veterinary ophthalmologist. If malignant, the most effective course is removal of the eye.

Because corneal sequestra typically start small and develop into larger and larger masses, it is recommended to schedule your pet for regular and thorough ophthalmic examinations from a pet care professional. Because they can vary so widely in size, shape, and color, it is often hard to detect a sequestrum with the naked eye. In cases of early developing corneal sequestrum, the deteriorated tissues may only be detectable under magnification. A veterinary professional will also be able to distinguish sequestra from normal color variations within the eye, which could potentially mask a developing problem and be missed by a casual inspection. 

Treatment of Dark Spots on the Eye in Cats

Iris melanoma, when benign, does not require any urgent treatment. A bi-annual examination should be enough to monitor and detect any further development of the melanoma. If tumors do advance, or cause disruption to the eye surface, laser removal options do exist. If melanoma are malignant, care must be taken to remove the tumors before they metastasize. This is often difficult to determine and has a low chance of preventing reoccurrence. The best and most reliable course is removal of the affected eye. 

When detected early, feline corneal sequestra can be removed through a standard surgical procedure known as partial lamellar keratectomy. This procedure, though commonly applied, is very meticulous and moderately invasive, requiring the use of general anesthesia. In this procedure, performed with the aid of a microscope, precision microscopic surgical tools are used to delicately remove the dead tissue. It is important to remove all of the dead tissue to prevent recurrence, but without substantially harming the healthy corneal tissues. In cases where the sequestrum is especially severe or deep, a conjunctival graft or even a corneal transplant may be sutured in to replace the removed tissues. 

Recovery of Dark Spots on the Eye in Cats

Iris melanoma can be effectively managed through regular monitoring of the condition and local treatment of minor irritations as they occur. 

There is a very good chance that an otherwise healthy cat can recover from corneal sequestrum with no residual pain or significant loss of vision. When properly diagnosed and treated with the appropriate surgery in the early stages, this condition can be corrected with high levels of success. Because the condition causes are relatively unknown, continued monitoring of the eye condition is recommended, as a cat experiencing a corneal sequestra is likely susceptible to future occurrence; particularly in the cases of additional eye injury or trauma.

Dark Spots on the Eye Questions and Advice from Veterinary Professionals

house cat
3 Years
Moderate condition
0 found helpful
Moderate condition

Has Symptoms

black eye

my cat has a black eye they were both yellow and i noticed it starting to get dark now its darker what is it ? should i be worried ? there is no discharge she isn't pawing or scratching it . she is eating using her litter ?

Dr. Michele King, DVM
Dr. Michele King, DVM
1054 Recommendations
Cats can have normal pigment changes in the iris of their eyes, but they can also get infections and cancers that need to be treated. Since I cannot see her eyes, it would be best to have a veterinarian examine her and look at her eyes, as they will be able to recommend any treatment that might be needed.

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domestic long
2 Years
Moderate condition
1 found helpful
Moderate condition

Has Symptoms

circular tissue on one eye

Our cat has what looks like an additional piece of circular tissue on top of one of his eyeballs. It was only noticeable when in certain lighting or angle. He also seems to have what we believe is his third eyelid slightly noticeable in the inner corners of the eye. He luckily has clear fluid leaking from the eyes but not excessively. He seems to be eating, sleeping, playing and acting normal. We haven't seen him rubbing his eyes or scratching at them anytime recently. What does this sound like? What could be the underlying cause of it? Whay lab work will he need to be sure he's ok and not very sick? What can we do at home to help him and to avoid this from happening again? It also looks like his inner eyelid is a whitish color vs the 'normal' pink. We're very concerned for our baby and we're going to take him to the DR ASAP but want to know if they can't get him in tomorrow is it safe to wait until the next day? How severe can this be? Will he go blind? We just noticed it about an hour ago

Dr. Michele King, DVM
Dr. Michele King, DVM
1054 Recommendations
Thank you for your email. Without seeing this piece of tissue that is on Simba's eye, I'm not able to comment on what it might be. If he is comfortable, not pawing or rubbing at his eye, and his eye isn't excessibly red, you should be able to wait until your veterinarian is able to see him in the next couple of days. if he starts rubbing at his eye or seems more irritated, he should be seen sooner. I hope that all goes well for him!

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California Spangled
1 Year
Fair condition
0 found helpful
Fair condition

Has Symptoms


My cat has a black thin layer on her actual eyeball looks like she fit something in her eye yet doesn't go away I just got her so I'm not sure how long she's had it. Doesn't seem to cause her any pain I don't think she's even aware it's there. I don't know what breed she is. She's striped with white feet. She has no symptoms this thing will not let me continue without it and it's forcing Mr to put incorrect info.

Dr. Callum Turner, DVM
Dr. Callum Turner, DVM
2478 Recommendations
Melanocytoma may cause a change in colour of the eye, but it is usually only a part of the around the iris; if there is a film covering the whole eye then I would visit a Veterinarian to take a look as I am unsure about the specific cause of this film and it would be beneficial to have a close look at it. Regards Dr Callum Turner DVM

That sounds about right altho it seems to look like charcoal dust on the outside of the eyeball itself not inside the eyeball but it is slight spot over the iris thank you I will have it double checked when I take her in for all her stuff

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Simba and Nala
1 Month
Mild condition
0 found helpful
Mild condition

Has Symptoms

Black mark


I just bought two kittens yesterday, but noticed that both kittens have small black marks under their eyes. Does this mean they are sick, or is it just a genetic mark? Do I need to take them to the vet? I am not sure about any other symptoms, as I just got these kittens yesterday.

Dr. Callum Turner, DVM
Dr. Callum Turner, DVM
2478 Recommendations
The cause may be a mild case of lentigo which is purely cosmetic (if it is on the eyelids); however you should keep an eye on both of them and have your Veterinarian check them over when you go for vaccination in a few weeks. Regards Dr Callum Turner DVM

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