Deposition of Brown Pigment in the Cornea of the Eye in cats
The deposition of brown pigment in the cornea of the eye in cats is called corneal pigmentation. This pigmentation can be caused by various diseases or environmental factors and impairs the cat’s vision.
Can Occur with the Following Diseases:
Basics and possible causes
The cornea is the clear, outer layer of the eye that protects the eye and allows light to enter. Pigmentation of the cornea occurs when melanin, the brown pigment, is deposited in the cornea. Normally, the cornea is transparent so that light can pass through unhindered. With pigmentation, the light is partially blocked, which can impair vision.
The most common causes of corneal pigmentation include chronic irritation or inflammation of the cornea. This can be triggered by various factors, such as the presence of irritants, mechanical stimuli, or as a reaction to other eye diseases. A common example is the entry of foreign bodies into the eye, which can lead to a defensive reaction.
Another possible cause is inflammation of the eyelids, called blepharitis, which can lead to irritation of the cornea. Chronic dryness of the eye, known as keratoconjunctivitis sicca, can also irritate the cornea and cause pigmentation.
Breed predispositions, as seen in brachycephalic breeds (breeds with short noses), can also play a role. These cats often have protruding eyes that are more susceptible to environmental influences. Genetic factors can also play a role, with certain breeds showing a higher tendency to pigmentation.
Infections caused by viruses or bacteria that cause inflammation of the cornea are also possible causes. Feline herpesvirus is a well-known example of a pathogen that can lead to eye problems, including corneal pigmentation.
Typical accompanying symptoms
- Eye discharge: Cats with corneal pigmentation may suffer from increased eye discharge, which may be clear or slimy. This is an indication of irritation or infection.
- Light sensitivity: Affected cats may show increased light sensitivity, as the pigmentation scatters and dazzles the incoming light.
- Redness of the eyes: Conjunctival hyperemia or redness of the eye itself may indicate inflammation, which often accompanies pigmentation.
- Increased blinking: Cats with eye problems often blink frequently as they try to minimize irritation or relieve pain.
- Behavioral changes: Some cats may become withdrawn or aggressive due to reduced vision or discomfort.
- Corneal opacity: The cornea may appear cloudy, indicating progressive pigmentation.
When to visit the vet?
An immediate visit to the vet is advisable if the cat shows signs of pain, such as constant blinking or eye rubbing. A veterinarian should also be consulted if there are visible changes to the cornea or if the eye is severely reddened.
If the cat shows signs of reduced vision, such as bumping into furniture or moving with Uncertainty / disorientation in familiar surroundings, this is another warning sign. Likewise, a veterinarian should be consulted for persistent or severe eye discharge to rule out an underlying infection or inflammation.
Longer-lasting symptoms or a deterioration of the condition also require a veterinary examination to avoid possible complications and initiate appropriate treatment.
Symptom recognition for animal owners and veterinary diagnostic procedures
As a pet owner, it is important to check your cat’s eyes regularly. Look for changes in eye color, cloudiness, or unusual discharge. Since cats often try to hide Eye pain, close observation of Behavioral changes is also crucial.
The veterinarian will perform a thorough examination of the eye. This may include the use of special eye drops containing fluorescent dyes to make injuries or ulcers of the cornea visible. A slit lamp examination can help assess the severity of the pigmentation and possible other damage.
In addition, tests for infectious agents, such as feline herpesvirus, can be performed. A tear production test can help diagnose the presence of dry eyes. If an underlying systemic disease is suspected, a blood test may also be necessary.
What can pet owners do and professional therapy options
As a pet owner, you can take some measures to relieve your cat’s discomfort and slow the progression of pigmentation. Avoid touching or rubbing the eyes, as this can increase irritation.
Keep the cat’s environment clean to reduce exposure to irritants. Make sure that no aggressive cleaning agents or fragrances are used nearby. Make sure that the cat is not exposed to drafts or strong winds, as this can further irritate the eyes.
Artificial tears or eye drops recommended by the veterinarian can be used to relieve dryness. These help to keep the cornea moist and alleviate the symptoms.
A balanced diet and, if necessary, dietary supplements containing omega-3 fatty acids or antioxidants can support eye health. Consult your veterinarian before making changes to your diet or supplements.
It is important to follow all veterinary treatment recommendations, including the regular use of prescribed medications. If there is Uncertainty / disorientation or a deterioration of the condition, the veterinarian should be consulted again immediately.
Are you unsure what is wrong with your pet? Feel free to use our symptom checker for more clarity.