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  • pupillary light
  • Organophosphates Pupillary light reflex Adie syndrome Argyll Robertson pupil Cycloplegia Marcus Gunn pupil Parinaud's syndrome Syphilis Glaucoma Farlex medical dictionary citing: Miller-Keane Encyclopedia & Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. (wikipedia.org)
  • The pupillary light reflex is an autonomic reflex that controls pupil diameter to accommodate for increases in illumination as perceived by the retina. (wikipedia.org)
  • Normally, as part of the pupillary light reflex, the pupil dilates in the dark and constricts in the light to respectively improve vividity at night and to protect the retina from sunlight damage during the day. (wikipedia.org)
  • Play media The pupillary light reflex (PLR) or photopupillary reflex is a reflex that controls the diameter of the pupil, in response to the intensity (luminance) of light that falls on the retinal ganglion cells of the retina in the back of the eye, thereby assisting in adaptation to various levels of lightness/darkness. (wikipedia.org)
  • Constricts
  • Because the lens cannot refract light rays at the edges well, the image produced by the lens is blurry around the edges so the pupil constricts when one attempts to focus on nearby objects. (wikipedia.org)
  • diameter
  • In two studies, pupil diameter was investigated alongside ratings of discomfort. (arvojournals.org)
  • Hopkinson 16 concluded there was no relationship between pupil diameter and the degree of discomfort from glare. (arvojournals.org)
  • We demonstrated that this PIPR was not correlated with subject characteristics such as age , race and gender , and that the only factor affecting the magnitude of the PIPR was the baseline pupil diameter . (uab.edu)
  • fibers
  • The sparing of the pupil is thought to be associated with the microfasciculation of the edge fibers which control the pupillomotor fibers, which control the pupil. (wikipedia.org)
  • pretectal
  • Nerves involved in the resizing of the pupil connect to the pretectal nucleus of the high midbrain, bypassing the lateral geniculate nucleus and the primary visual cortex. (wikipedia.org)
  • light
  • These ipRGCs contribute to the PLR and are responsible for the sustained pupilloconstriction observed following light offset (the post-illumination pupil response (PIPR)) . (uab.edu)
  • Using a newly-developed , wide-field optical system , we demonstrate that all normal subjects display a post-illumination pupil response in response to a 10-second , 470nm light stimulus . (uab.edu)
  • The presence of ipRGCs were first noted in 1923 when rodless, coneless mice still responded to a light stimulus through pupil constriction, suggesting that rods and cones are not the only light sensitive neurons in the retina. (wikipedia.org)
  • ganglion
  • 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. (wikipedia.org)
  • size
  • Eye movement was recorded using an electro-oculogram (EOG), and pupil size was recorded using Tobii glasses. (arvojournals.org)
  • In that experiment using a constant background luminance, the glare luminance was slowly increased to the point at which it was considered just perceptible, at which point pupil size was determined using flash photography. (arvojournals.org)
  • the use of pilocarpine would reduce the size of the pupils, relieving these symptoms. (wikipedia.org)
  • response
  • In conclusion , using a newly-developed , wide-field optical system , we have demonstrated that all normal subjects display a post-illumination pupil response which is reduced in patients with GON . (uab.edu)