Pupillary light reflex
Reflex controlling the diameter of the pupil in response to the intensity of light
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 of vision to various levels of lightness/darkness. A greater intensity of light causes the pupil to constrict (miosis/myosis; thereby allowing less light in), whereas a lower intensity of light causes the pupil to dilate (mydriasis, expansion; thereby allowing more light in).
Nº Q2306768 ★
Common · History
Pupillary light reflex
Reflex controlling the diameter of the pupil in response to the intensity of light
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 of vision to various levels of lightness/darkness. A greater intensity of light causes the pupil to constrict (miosis/myosis; thereby allowing less light in), whereas a lower intensity of light causes the pupil to dilate (mydriasis, expansion; thereby allowing more light in).
Last price
—
Floor price
—
7-day median
—
30-day sales
0
30-day range
—
In circulation
0
Price history
median
low – high
sales
No sales in this period
Show table
| Date | median | Low | High | sales |
|---|
Sales history
- Last sale
- —
- 30-day average
- —
- 30-day low
- —
- 30-day high
- —
- Sales 7d
- 0
- Sales 30d
- 0
No sales yet.
Anonymous sales: no buyer or seller shown. Figures count player-to-player sales only.
From Wikipedia
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 of vision to various levels of lightness/darkness. A greater intensity of light causes the pupil to constrict (miosis/myosis; thereby allowing less light in), whereas a lower intensity of light causes the pupil to dilate (mydriasis, expansion; thereby allowing more light in). Thus, the pupillary light reflex regulates the intensity of light entering the eye. Light shone into one eye will cause both pupils to constrict. First described by Rhazes of Baghdad in the ninth century, the PLR has since become a standard examination tool for all healthcare professionals.
Text: Wikipédia, CC BY-SA 4.0. ·
Related cards
Intraocular pressure
Fluid pressure inside the eye
Nº Q650050 ★★★
Specular reflection
Mirror-like wave reflection
Nº Q1079524 ★★
Photic sneeze reflex
Sneezing in response to numerous stimuli, such as looking at bright lights
Nº Q671758 ★★★
Cornea
Structure of the eye
Nº Q168291 ★★★
Corneal reflex
The reflex process in which a mechanical stimulus applied to the eye elicits a response of the eyelid closing.
Nº Q1785965 ★
Reflexology
Alternative medical practice involving pressure to specific points on the feet and hands
Nº Q449058 ★★★