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Symptoms include sudden permanent blindness, but may occur more slowly over several days, weeks or months, [3] dilated pupils.Pupillary light reflexes are usually reduced but present; the slow phase mediated by melanopsin in retinal ganglion cells is retained.
Progressive retinal atrophy (PRA) is a group of genetic diseases seen in certain breeds of dogs and, more rarely, cats. Similar to retinitis pigmentosa in humans, [1] it is characterized by the bilateral degeneration of the retina, causing progressive vision loss culminating in blindness.
The least common type of glaucoma in dogs is primary open-angle glaucoma (POAG), although this is the most common type that affects humans. [1] In the Beagle, POAG is an inherited autosomal recessive trait. [2] Secondary glaucomas occur when other eye diseases alter the flow of aqueous humor either into or out of the eye.
Dogs, on the other hand, only have two types of cones in their eyes, allowing them to detect blue and yellow, VCA Animal Hospitals reports. A dog's limited color perception is classified as ...
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The ptosis from inactivation of the superior tarsal muscle causes the eye to appear sunken in, but when actually measured, enophthalmos is not present. The phenomenon of enophthalmos is seen in Horner's syndrome in cats, rats, and dogs. [5] Sometimes there is flushing on the affected side of the face due to dilation of blood vessels under the skin.
Chronic superficial keratitis (CSK), also known as pannus or Uberreiter's disease, is an inflammatory condition of the cornea in dogs, particularly seen in the German Shepherd. Both eyes are usually affected. The corneas gradually become pigmented and infiltrated by blood vessels, and the dog may eventually become blind.
Image credits: dogswithjobs There’s a popular saying that cats rule the Internet, and research has even found that the 2 million cat videos on YouTube have been watched more than 25 billion ...