The Purpose of the Third Eyelid: a Closer Look at Your Cat’s Eyes

What is the Third Eyelid and What Does it Do?

The third eyelid, periorbital membrane or haw, is a small fold of skin and hairs in the inner corner of the eye helps protect the surface of the eye from foreign bodies such as dust and bacteria. It can be seen as a thin greyish film that covers part of the white area of the eye. This third eyelid is found in most vertebrates aside from humans.

The main function of the third eyelid is to protect the eye from irritation or infection by wiping away any dirt, or debris that may have become stuck to the surface of the eye. It also works to keep the eye lubricated and moist by providing a layer of tears and mucus over the surface of the eye, as well as creating an air-tight seal to help prevent unwanted particles from entering the eye. Additionally, the third eyelid helps regulate the amount of light that enters the eye.

In some animals, the third eyelid helps with vision. For these animals, it is able to move across the eye and act as a lens, allowing the animal to get a clear image.

On occasion in cats and dogs, the third eyelid can become prominent and symbolize a medical issue. A number of conditions could lead to this, including allergies, infections, and nerve damage. If you notice your pet’s third eyelid becoming more visible than normal, it would be best to consult your veterinarian to diagnose and prescribe treatment.

The Symptoms of Third Eyelid Disease in Cats

Third eyelid disease, also known as nictitating membrane prolapse (NMP), is a relatively common condition that affects cats. It occurs when the third eyelid, or nictitans, drops down and becomes visible in the inner corner of the eye. This can affect one or both eyes.

While it may initially appear minor and relatively harmless, it can be indicative of serious underlying health problems and should be addressed as soon as possible. Symptoms of third eyelid disease in cats include redness and inflammation in the area; swelling around the eye; discharge from the eye (which can be yellow, green, or even bloody); blinking or rapid eye movement; sensitivity to light; cloudiness or opacity in the cornea; and squinting. In severe cases, the eye(s) may become closed or protrude abnormally. Prompt medical attention for these symptoms is advised. If untreated, third eyelid disease may result in permanent vision loss and other health complications.

The Causes and Treatment Options for Third Eyelid Disorders

Third Eyelid Disorders, or Meibomian Gland Dysfunction (MGD) as they are medically known, can have many causes. These include blocked tear ducts, which prevent tears from being produced and spread over the eye’s surface; altered eyelids; a lack of oil in the tears; and, infrequent blinking. Symptoms of Third Eyelid Disorders often include redness and soreness around the eyes, heavy tearing and feelings of burning, itching and discomfort in the corners of the eyes.

Treatment options for MGD depend on the underlying cause. If the disorder is caused by inhibited tear production, hypochlorin eyedrops or artificial tears may be prescribed. Blocked tear ducts may require a surgical procedure to open them. Altered eyelids can be treated with surgically correcting their shape, as well as using daily lubricants to keep the irritated areas moist. Finally, if a lack of oil in the tears is causing MGD, daily lid hygiene combined with a short-term course of antibiotics may be prescribed.

In addition to the treatments provided by your eye doctor, there are also lifestyle changes you can make to help treat MGD. These include increasing the frequency of blinking, reducing air conditioning or heater blasts directed at your face, or avoiding excess use of computer screens. Additionally, keeping the face clean and moisturized can also aid in preventing and treating Third Eyelid Disorders.

Prevention and Care for Your Cat’s Third Eyelid Health

Taking care of your cat’s eye health is essential to keeping them healthy and helping them live a happy and long life. One important part of eye health is watching out for the third eyelid, also known as the nictitating membrane. This is a small cushion of tissue that helps keep your cat’s eyes protected and healthy.

Prevention of third eyelid health issues can involve checking your pet’s eyes regularly for signs of irritation, redness or swelling. Animal hospital visits should include an examination of the eyes and eyelids. If you notice any type of irritation or change in your cat’s eyes, it is important to have their eyes checked out by a professional. In the event that you observe changes in the color or shape of the third eyelid, contact your vet immediately.

In terms of care, there are a few different steps. The first step is making sure your cat is kept in a clean environment to prevent dust or allergens from getting into your pet’s eyes. Keeping them separate from other pets can also reduce the risk of eye infections. Additionally, feeding them proper nutrients to aid in overall eye health, using hypoallergenic cat litter, and cleaning their eyes regularly with a soft cloth and warm water help maintain the health of the third eyelid. Lastly, if your cat begins to squint unexpectedly, rub its eyes excessively, or display any other behavior that could be indicative of corneal disease, take him/her to the vet as soon as possible.

Maintaining your cat’s third eyelid health is an important part of keeping your pet’s vision healthy and headed off long-term problems. Taking some simple precautions, regular checkups, and paying close attention to your pet’s eye health can make a world of difference.