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The hair of a cat is made of mainly protein, and cats need about 25-30% protein in their diets, much higher than what a dog needs. [5] A deficiency in protein usually happens when kittens are fed dog food or when low-protein diets are fed improperly. [5] If a cat has a protein deficiency, the cat will lose weight.
Epiretinal membrane or macular pucker is a disease of the eye in response to changes in the vitreous humor or more rarely, diabetes.Sometimes, as a result of immune system response to protect the retina, cells converge in the macular area as the vitreous ages and pulls away in posterior vitreous detachment (PVD).
A number of drugs can cause changes in the retina that can lead to macular edema. The effect of each drug is variable and some drugs have a lesser role in causation. The principal medications known to affect the retina are latanoprost, epinephrine, rosiglitazone, timolol and thiazolidinediones among others. [7] [8]
Recently, central serous chorioretinopathy has been understood to be part of the pachychoroid spectrum. [5] [6] In pachychoroid spectrum disorders, of which CSR represents stage II, the choroid, the highly vascularized layer below the retina, is thickened and congested with increased blood vessel diameter, especially in the deep choroid (the so-called Haller's layer).
One of the cat diseases caused by malnutrition is central retinal deficiency, a dysfunction in cats that can be hereditary as well. [14] The retina, a thin layer of tissue in the back of the eye, is the structure affected by this disorder. This structure receives the light gathered and focused from the lens. [15]
The retina can be reattached even with the membrane in place. The other type forms as very thick contractile membranes which pull at the retina. These are opaque and block the light falling on the retina so the retinal reattachment surgery needs to be performed after manually peeling the membrane off. [11] [12]
Retinal dysplasia is an eye disease affecting the retina of animals and, less commonly, humans. It is usually a nonprogressive disease and can be caused by viral infections, drugs, vitamin A deficiency, or genetic defects .
Diagram of the human eye showing macula and fovea. Although J. D. Gass originally identified four types of idiopathic juxtafoveolar retinal telangiectasis in 1982, contemporary researchers describe three types collectively known as idiopathic juxtafoveal telangiectasia: macular telangiectasia type 1, macular telangiectasia type 2, and macular telangiectasia type 3.
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