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An ophthalmoscopic view of the retina showing advanced signs of diabetic retinopathy including two pale cotton wool spots. Cotton wool spots are opaque fluffy white patches on the retina of the eye that are considered an abnormal finding during a funduscopic exam (also called an ophthalmoscopic exam). [1]
In this condition, cat retinal ganglion cells and lateral geniculate nucleus cells, having their receptive fields centred in the uniform grey patch, did not respond; on the other hand, primary visual cortex neurons were modulated by luminance changes far outside their receptive fields.
This is notable in horses, cows, cats, dogs, the urban crow [7] and the ball python [8] but is also found in many other species. Due to the lack of melanin production in both the retinal pigmented epithelium (RPE) and iris , those affected by albinism sometimes have pink pupil due to the underlying blood vessels showing through.
Perhaps the Cheshire Cat is one of the most famous cats in world culture, but for each of us, the most important kitty is the one that lives with us, rubs against our legs, and brazenly demands ...
Photographing street cats also demands a sharp eye for detail, quick reflexes, and an understanding of their natural behaviors. My experience with red squirrels may have honed me the ability to ...
Cat senses are adaptations that allow cats to be highly efficient predators. Cats are good at detecting movement in low light, have an acute sense of hearing and smell, and their sense of touch is enhanced by long whiskers that protrude from their heads and bodies. These senses evolved to allow cats to hunt effectively at dawn and dusk.
Calico cats are almost always female, due to the way that coat colors work on cats. The genes determining whether a cat has an orange or black coat are located on the X chromosome, and exhibit co ...
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