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Adaptation (eye) In visual physiology, adaptation is the ability of the retina of the eye to adjust to various levels of light. Natural night vision, or scotopic vision, is the ability to see under low-light conditions. In humans, rod cells are exclusively responsible for night vision as cone cells are only able to function at higher ...
In the most familiar acuity test, a Snellen chart is placed at a standard distance: 6 metres. At this distance, the symbols on the line representing "normal" acuity subtend an angle of five minutes of arc, and the thickness of the lines and of the spaces between the lines subtends one minute of arc. This line, designated 6/6 (or 20/20), is the ...
He resembles a bipedal whale with gray skin, sky blue eyes, and pillar-like legs, wearing a black battle shirt and black shorts, and stands twenty feet tall. When he is seen by humans on Hawaii , he typically attempts to pass himself off as Samoan , though Lilo once told Mertle he was a dog-catcher from Nairobi , which the other girl believed.
The human eye is a sensory organ in the visual system that reacts to visible light allowing eyesight. Other functions include maintaining the circadian rhythm, and keeping balance . Arizona Eye Model. "A" is accommodation in diopters. The eye can be considered as a living optical device. It is approximately spherical in shape, with its outer ...
Eye-rolling is a gesture in which a person briefly turns their eyes upward, often in an arcing motion from one side to the other. In the Anglosphere, it has been identified as a passive-aggressive response to an undesirable situation or person. The gesture is used to disagree or dismiss or express contempt for the targeted person without ...
Baseball and cricket are the best-known members of a family of related bat-and-ball games.Both have fields that are 400 feet (120 m) or more in diameter between their furthest endpoints, [1] offensive players who can hit a thrown/"bowled" ball out of the field and run between safe areas to score runs (points) at the risk of being gotten out (forced off the field of play by the opposing team ...
We've all grown up thinking that sitting too close to the television is damaging to our eyes ... but that might not be the case. Technology spawns lots of confusion ... and a few affectionately ...
Photophobia is a medical symptom of abnormal intolerance to visual perception of light. [1] As a medical symptom, photophobia is not a morbid fear or phobia, but an experience of discomfort or pain to the eyes due to light exposure or by presence of actual physical sensitivity of the eyes, [2] though the term is sometimes additionally applied to abnormal or irrational fear of light, such as ...