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  2. Pupillary light reflex - Wikipedia

    en.wikipedia.org/wiki/Pupillary_light_reflex

    The pupillary light reflex (PLR) or photopupillary reflex is a reflex that controls the diameter of the pupil, in response to the intensity 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.

  3. Swinging light test - Wikipedia

    en.wikipedia.org/wiki/Swinging_light_test

    For an adequate test, vision must not be entirely lost. In dim room light, the examiner notes the size of the pupils. The patient is asked to gaze into the distance, and the examiner swings the beam of a penlight back and forth from one pupil to the other, and observes the size of pupils and reaction in the eye that is lit.

  4. Cataract - Wikipedia

    en.wikipedia.org/wiki/Cataract

    Posterior capsular opacification, also known as after-cataract, is a condition in which months or years after successful cataract surgery, vision deteriorates or problems with glare and light scattering recur, usually due to thickening of the back or posterior capsule surrounding the implanted lens, so-called 'posterior lens capsule opacification'.

  5. Light reaction - Wikipedia

    en.wikipedia.org/wiki/Light_reaction

    Light reaction may refer to: Light-dependent reactions; Pupillary light reflex This page was last edited on 29 December 2019, at 06:01 (UTC). Text is available ...

  6. Pupillary reflex - Wikipedia

    en.wikipedia.org/wiki/Pupillary_reflex

    Next, constriction of the pupil occurs. 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. [citation needed] Lastly, accommodation of the lens occurs. This is an alteration in the curvature of the lens that ...

  7. Mydriasis - Wikipedia

    en.wikipedia.org/wiki/Mydriasis

    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. A mydriatic pupil will remain excessively large even in a bright environment. The excitation of the radial fibres of the iris which ...

  8. How to be a safer driver after 65 - AOL

    www.aol.com/safer-driver-65-154500027.html

    Aging can affect everything from your reaction time to your peripheral (side) vision when you get behind the wheel. At the same time, driving is a crucial part of staying engaged , social , and ...

  9. Photochemistry - Wikipedia

    en.wikipedia.org/wiki/Photochemistry

    Photoexcitation is the first step in a photochemical process where the reactant is elevated to a state of higher energy, an excited state.The first law of photochemistry, known as the Grotthuss–Draper law (for chemists Theodor Grotthuss and John W. Draper), states that light must be absorbed by a chemical substance in order for a photochemical reaction to take place.