Dark and Light Adaptation Curves

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Dark adaptation curve shows how the eye adjusts to bright light, while light adaptation curve shows how the eye adjusts to low light
Dark adaptation curve shows how the eye adjusts to rapid light changes, while light adaptation curve shows how the eye adjusts to slow light changes
Dark adaptation curve shows how the eye adjusts to color vision, while light adaptation curve shows how the eye adjusts to black and white vision
Dark adaptation curve shows how the eye adjusts to low light, while light adaptation curve shows how the eye adjusts to bright light (correct)

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The primary difference between dark and light adaptation curves is the direction of sensitivity change: in dark adaptation, sensitivity increases, while in light adaptation, sensitivity decreases initially and then increases.
Dark adaptation curve shows a gradual increase in sensitivity as the eye adapts to low light conditions, whereas light adaptation curve shows an initial decrease in sensitivity followed by an increase as the eye adapts to bright light conditions.

The initial decrease in sensitivity in the light adaptation curve is caused by the bleaching of photopigments, particularly rhodopsin, in the retina, which reduces the eye's ability to respond to light.

The rod cells in the retina are primarily responsible for dark adaptation, as they are more sensitive to low light conditions and can respond to single photons of light.