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The physiological and neurological mechanism that allows the eye and visual system to adjust its operating sensitivity range to respond effectively across a huge range of light levels, from dim moonlight to bright sunlight.
read more about visual adaptation ...Dark Adaptation (increased sensitivity in dim light) involves the regeneration of rod photopigments. Light Adaptation (decreased sensitivity in bright light) is faster and involves pupil constriction and cone pigment adjustment.
The primary mechanisms involve changes in pupil size and photochemical changes in the photoreceptors (rods and cones), which alter the amount of light energy required to trigger a response.
Dark adaptation slows significantly with age, making it more difficult for older individuals to see when transitioning from a bright to a dark environment.
No, visual adaptation is an entirely automatic, involuntary physiological process.
A shift in peak spectral sensitivity toward shorter (bluer) wavelengths that occurs during the transition from photopic (light-adapted) to scotopic (dark-adapted) vision.
Dark adaptation is slow because it requires the time-consuming chemical regeneration of Rhodopsin, the photopigment in the rod photoreceptors.