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Collie eye anomaly (CEA) is a congenital, inherited, bilateral eye disease of dogs, which affects the retina, choroid, and sclera. It can be a mild disease or cause blindness. It can be a mild disease or cause blindness.
The most common initial symptom is scaling and loss of pigment on the nose. The surface of the nose becomes smooth gray, and ulcerated, instead of the normal black cobblestone texture. Over time the lips, the skin around the eyes, the ears, and the genitals may become involved. [9] Lesions may progress to ulceration and lead to tissue ...
This absence results in a primarily black appearance of the central eye. Aniridia can be congenital , typically affecting both eyes, or caused by a penetrant injury. [ 1 ] Congenital aniridia is not simply an iris defect but a more complex condition affecting multiple parts of the eye, with macular and optic nerve hypoplasia , cataract , and ...
The most common colour of dog nose is black. However, a number of genes can affect nose colour. A blue dog nose is genetically impossible. But greyhounds without the blue dilution gene are sometimes found. Therefore, a dog that appears to be "blue" may have a black nose and black eyes because it is actually a black dog with the gray gene, not a ...
A visibly white sclera is perceived as a sign of good health and youthfullness, [13] this could have been a criterion of selection when looking for a mate. In this case, humans' ability to communicate with their eyes (glancing, cluing at others) would only be a consequence of a very visible sclera.
The fibrous tunic, also known as the tunica fibrosa oculi, is the outer layer of the eyeball consisting of the cornea and sclera. [4] The sclera gives the eye most of its white color. It consists of dense connective tissue filled with the protein collagen to both protect the inner components of the eye and maintain its shape. [5]
Eumelanin (black) pigment colors a dog's nose, so a Liver dog will have a Liver colored nose. If the nose is black, the dog is not a liver. A pink nose has nothing to do with liver dilution, and will not help determine if a dog is liver or not. Liver will also dilute a dog's brown eyes to amber/yellow. It is also possible for a dog to be a ...
Nevus of Ota is a hyperpigmentation [3] that occurs on the face, most often appearing on the white of the eye. It also occurs on the forehead, nose, cheek, periorbital region, and temple. [4] It was first reported by Masao Ōta of Japan in 1939. [5]