Cataracts in Cats

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Cloudiness of the Eye Lens in Cats

Cataract refers to the cloudiness in the crystalline lens of the eye, varying from complete to partial opacity. When the eye lens (located directly behind the iris) is clouded, it prevents light from passing to the retina, which can cause vision loss.

Most cases of cataracts are inherited; for instance, Persian, Birmans, and Himalayans cats are all predisposed to cataracts.

Symptoms and Types

Symptoms typically relate to the degree of vision impairment. Cats with less than 30 percent lens opacity, for example, display little or no symptoms, whereas those with more than 60 percent opacity of the lens may suffer from loss of vision or have difficulty seeing in dimly lit areas.

Meanwhile, if your cat has diabetes mellitus-related cataract, you may also observe increased thirst, increased frequency of urination, and weight loss in your cat, along with vision impairment symptoms.


Although most cases of cataracts are inherited, the following are other causes and risk factors associated with the condition:

  • Diabetes mellitus
  • Old age
  • Electric shock
  • Inflammation of the eye's uvea (uveitis)
  • Abnormally low levels of calcium in blood (hypocalcemia)
  • Exposure to radiation or toxic substances (e.g., dinitrophenol, naphthalene)


If you should observe cloudiness in one or both of the cat's eyes, you should bring it in to see a veterinarian immediately. There, the veterinarian will ask for a thorough history of your cat’s health, including the onset and nature of the symptoms, and possible incidents that might have precipitated the problem. He or she will then perform a complete physical examination, focusing on the eyes and ocular region, to determine the severity of the problem.

Routine diagnostic tests, such as complete blood count, biochemistry profile, and urinalysis, may be conducted. However, the results of these tests are usually non-specific unless another concurrent disease like diabetes mellitus or hypocalcemia are at the root of the problem. Ultrasounds or electroretinography (which measures the electrical responses of cells present in the retina) are two forms of advanced diagnostic exams which also help determine the severity of the issue and may confirm whether surgery is necessary to correct a cataract.

  • another concurrent disease
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The layer of the eye that is charged with receiving and processing images


An in-depth examination of the properties of urine; used to determine the presence or absence of illness


A medical condition in which the uvea becomes inflamed.


Anything having to do with the eye or care of the eye


The term used to refer to the part of the eye containing the iris, the cilia, and the choroid.


Anything having to do with the eye


A low level of calcium in the blood


Found inside the eye


The colored layer around the pupil


The breaking down of large globs of fat into smaller parts

Courtesy of Original Article