Day blindness (when cones are affected).Night blindness (when rods are affected).Affects kittens that have been exposed and infected with feline leukemia or feline panleukopenia, either while in utero or after birth.Appears as folds or rosette shapes on the retina.Begins in utero, with progressive atrophy of the vascular system that supports the eye lens.Persistent hyperplastic tunica vasculosa lentis (PHTVL) and persistent hyperplastic primary vitreous (PHPV).Lack of pupils or abnormally-shaped pupil.Congenital glaucoma (high pressure within the eye) with buphthalmos (abnormal enlargement of eyeball).May not have symptoms besides slight bulging of the iris, unless the cyst is interfering with the field of vision.Often not visible, as the cyst is located behind the iris.Tumor-like cysts on eyelid(s) conjuctiva, or cornea.Fetal tissue will remain on the eye after birth rare in cats.Inherited in Burmese, Persian, and Siamese cats.Variable eyelid twitching and watery eyes.
May appear as notch in eyelid, or tissue of the eyelid may be missing.
The following are some of the more common issues and their corresponding signs: There are a variety of abnormalities that can affect a cat's eye or surrounding tissues. Exposure to toxic compounds, lack of nutrients, and systemic infections and inflammations during pregnancy (such as panleukopenia) are other potential risk factors for ocular abnormalities. Ocular abnormalities can also develop spontaneously (e.g., colobomas of ther anterior) or occur in utero. This affects the cat's ability to see in both low light and daylight. Most defects are genetically inherited for example, photoreceptor dysplasia, which is indicated by pupils inability to contract normally in response to light, is more prone in Abyssinian, Persian, and Domestic Shorthair cats. Congenital abnormalities of the eyeball or its surrounding tissue can be evident in a kitten shortly after birth, or may develop within the first six to eight weeks of life.
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