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In many species, the third eyelid plays an essential role in vision by supplying oxygen and nutrients to the eye via tear production. [4] Normally, the gland can turn inside-out without detachment. [3] Cherry eye results from a defect in the retinaculum which is responsible for anchoring the gland to the periorbita.
The membrane can, however, be seen clearly by gently opening the eye of the healthy animal when it is asleep, or by pushing down/applying pressure on the eyeball, which will cause it to appear. In some breeds of dogs, the nictitating membrane can be prone to prolapse of the gland of the third eyelid, resulting in a condition called cherry eye. [9]
In dogs, the ear canal has a "L" shape, with the vertical canal (first half) and the horizontal canal (deeper half, ending with the eardrum) The frequency range of dog hearing is between 16–40 Hz (compared to 20–70 Hz for humans) and up to 45–60 kHz (compared to 13–20 kHz for humans), which means that dogs can detect sounds beyond the ...
Glaucoma in a dog. Canine glaucoma refers to a group of diseases in dogs that affect the optic nerve and involve a loss of retinal ganglion cells in a characteristic pattern. . An intraocular pressure greater than 22 mmHg (2.9 kPa) is a significant risk factor for the development of glauco
Ectropion (eyelid folding outward) is a common condition in dogs, usually affecting the lower lid. Breeds associated with ectropion include the Cocker Spaniel, the St. Bernard, the Bloodhound, and the Basset Hound. [63] Entropion (eyelid folding inward) is a common condition in dogs, especially the Chow Chow, Shar Pei, St. Bernard, and Cocker ...
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An epicanthic fold or epicanthus [6] is a skin fold of the upper eyelid that covers the inner corner (medial canthus) of the eye. [3] However, variation occurs in the nature of this feature and the presence of "partial epicanthic folds" or "slight epicanthic folds" is noted in the relevant literature.
Image credits: alpha.paw Quite commonly cats are thought to be the rock stars of the internet. At least in 2015, cats drove almost 15% of all internet traffic and were Googled about 30 million ...