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The dark blue, teal, and gold tapetum lucidum from the eye of a cow Retina of a mongrel dog with strong tapetal reflex. The tapetum lucidum (Latin for 'bright tapestry, coverlet'; / t ə ˈ p iː t əm ˈ l uː s ɪ d əm / tə-PEE-təm LOO-sih-dəm; pl.: tapeta lucida) [1] is a layer of tissue in the eye of many vertebrates and some other animals.
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. The pupil's light reflex is maintained as this is controlled via the parasympathetic nervous system. [citation needed]
Some skates and rays have crescent shaped pupils, [17] gecko pupils range from circular, to a slit, to a series of pinholes, [18] and the cuttlefish pupil is a smoothly curving W shape. Although human pupils are normally circular, abnormalities like colobomas can result in unusual pupil shapes, such as teardrop, keyhole or oval pupil shapes.
The pupils of the sheep in this clip appear as dark, horizontal rectangles. ... Humans, other primates, and dogs have round (spherical) pupils, which are useful for general all-round vision. Cats ...
In mature dogs, from the shoulder backwards and along the 'saddle', the hair is short and close. Hair long from the forehead backwards, with a distinct silky 'topknot'. "On the foreface hair short ...
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.
To a cat, a show literally just looks like never-ending, mind numbing flickers of light. Some pets do like to watch these weird, garbled images, though. If you've got a couch potato pooch, check ...
Dogs' vision is dichromatic; their visual world consists of yellows, blues, and grays. [39] They have difficulty differentiating between red and green, [40] and much like other mammals, the dog's eye is composed of two types of cone cells compared to the human's three. The divergence of the eye axis of dogs ranges from 12 to 25°, depending on ...