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dark ring around cat iris

It extends from the ciliary muscles to the optic nerve at the back of the eye. The iris is the colored part of the eye. My cat is a 8 year old Calico. Black Ring around my cat's eye Allison1ga. This is new, although I'm not sure how new, because I know he never had these when I first got him from Petsmart in February. 7 Cool Facts About Cat Eye Colors ... Their eyes definitely do change not only with light and dark but with things going on around them. Keep an eye out for skin lesions on your own skin. it's just when two colors appear in the iris at the same time. no big deal either way. A limbal ring is a dark ring around the iris of the eye, where the sclera meets the cornea. The appearance and visibility of the limbal ring can be negatively affected by a variety of medical conditions concerning the peripheral cornea. If you see a dark outline around your iris -- the colored part of your eye -- this is your limbal ring. nothing to worry about. It is a dark-colored manifestation of the corneal limbus resulting from optical properties of the region. Cats usually have some variety of green, yellow, or blue eyes. It's not unusual for the iris … Dark spots can develop in cats of any eye colour and may be cancerous (malignant) or benign. Kittens are born with blue eyes. Cats can develop cat eye problems not just from a direct problem with their eyes such as cat glaucoma or cat herpes, but also secondary to systemic cat diseases such as feline immunodeficiency virus or cat leukemia. It is darkest when we are at our healthiest and naturally fades with age and poor health. Iris melanosis are caused by the proliferation of melanocytes, the cells responsible for the production of pigmentation. Cats can have a ring of pigment around the periphery of the iris, but I would not expect this to change noticeably at any point. If you notice changes in your cat's iris or the appearance of splotches of other colors, contact your vet. I noticed Onyx has black rings around the irises of his eyes. When it comes to cat health, eyes have long been of particular interest to me. It goes almost the whole way around. For the sake of simplicity, we will refer to the benign form as iris melanosis and the cancerous form as malignant melanomas. Which they are for the majority but they can also indicate other things like heavy metal toxicity like copper, known as “Wilson disease”. I just noticed that she has a black ring around the inside of her right eyelid (her 3rd eyelid looks fine-hers have always been partly visible). The choroid is the inner lining of the eyeball. Eye color commonly changes and fade with age. Occasionally, a cat will be "odd-eyed"; each eye is a different color. These lesions are often circular and resemble a ring, or a pattern of rings. it also might be something called "Dichroic Eyes" and it's genetic. 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