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A mydriatic pupil will remain excessively large even in a bright environment. The excitation of the radial fibres of the iris which increases the pupillary aperture is referred to as a mydriasis. More generally, mydriasis also refers to the natural dilation of pupils, for instance in low light conditions or under sympathetic stimulation.
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The tapetum lucidum, in animals that have it, can produce eyeshine, for example as seen in cat eyes at night. Red-eye effect, a reflection of red blood vessels, appears in the eyes of humans and other animals that have no tapetum lucidum, hence no eyeshine, and rarely in animals that have a tapetum lucidum. The red-eye effect is a photographic ...
Cats can learn words faster than human babies, a new study has found. The felines have been living alongside humans for around 12,000 years, and during this time, they seem to have closely ...
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.
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 seem to have a sense of when their humans are feeling unwell and if their favorite person is laid up on the couch or has taken to their bed with a cold or the flu, they'll often camp out ...
Previously, we didn’t know whether cats could learn human words in the same way as dogs, so Takagi and her team carried out an experiment that has been used to study language development in 14 ...