the reflex adaptation of the eye to bright light, consisting of an increase in the number of functioning cones, accompanied by a decrease in the number of functioning rods (opposed to ).
light adaptation n.
The adjustment of the eye under increased illumination, in which the sensitivity to light is reduced. Also called photopic adaptation.
- Light-adapted eye
light-adapted eye n. An eye that has been exposed to light of relatively high intensity and has undergone adjustments of photochemical change and constriction of the pupil. Also called photopic eye.
- Light a fire under
Also, build a fire under. Urge or goad to action, as in If we don’t light a fire under that committee, they’ll never do any work. This hyperbolic colloquialism uses light in the sense of “ignite,” a usage dating from the mid-1100s.
noun, Meteorology. 1. a wind of 1–3 miles per hour (0.5–1.3 m/sec). noun 1. very light air movement of force one on the Beaufort scale
noun 1. . noun 1. (in architectural shades and shadows) a surface in a plane tangent to the parallel rays from the theoretical light source, treated as a shade surface.