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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.
The ganglion cells give information about ambient light levels, and react sluggishly compared to the rods and cones. Signals from photosensitive ganglion cells have multiple functions including acute suppression of the hormone melatonin , entrainment of the body's circadian rhythms and regulation of the size of the pupil.
When pupils are dilated, it means that they grow larger in size. This can happen for a number of different reasons, including drug use and arousal. 7 reasons why your pupils may be dilated, from ...
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.
Roswell High is a young adult book series written by Melinda Metz and published by Pocket Books.The ten-book series chronicles the adventures of three teen aliens and their human friends, who attend the fictional Ulysses F. Olsen High in Roswell, New Mexico.
The series was written by "Tabor Evans", a house pseudonym used by a number of authors at Jove Books. Lou Cameron helped create the character and wrote a number of the early books in the series. The first book was published in 1978 and new ones were added at a rate of approximately one a month through 2015.
More severe myopia needs lens powers further from zero (more negative). However, strong eyeglass prescriptions create distortions such as prismatic movement and chromatic aberration . Strongly myopic wearers of contact lenses do not experience these distortions because the lens moves with the cornea, keeping the optic axis in line with the ...
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