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Mydriasis is the dilation of the pupil, usually having a non-physiological cause, [3] or sometimes a physiological pupillary response. [4] Non-physiological causes of mydriasis include disease, trauma, or the use of certain types of drug.
This odd-eyed cat displays red-eye effect of its tapetum lucidum only in its blue eye. In flash photography the light of the flash occurs too fast for the pupil to close, so much of the very bright light from the flash passes into the eye through the pupil, reflects off the fundus at the back of the eyeball and out through the pupil. The camera ...
Cats will adjust their eyes during the day, allowing less light to filter in, while their pupils will expand at night to allow for more light, Purina reports. Feline eyes also have more "rods ...
Dilation and constriction of the pupil. Pupillary response is a physiological response that varies the size of the pupil, via the optic and oculomotor cranial nerve.. A constriction response (), [1] is the narrowing of the pupil, which may be caused by scleral buckles or drugs such as opiates/opioids or anti-hypertension medications.
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Cats have one of the broadest ranges of hearing among mammals. [11] Humans and cats have a similar range of hearing on the low end of the scale, but cats can hear much higher-pitched sounds, up to 64 kHz, which is 1.6 octaves above the range of a human, and 1 octave above the range of a dog.
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Fully dilated pupil prior to ophthalmoscopic examination to remove lens astigmatism (spasm of accommodation) Examination of retina (fundus examination) is an important part of the general eye examination. Dilating the pupil using dilating eye drops greatly enhances the view and permits an extensive examination of peripheral retina.