How long can adaptation of the eye to night vision take?
LIGHT AND DARK ADAPTATION
Light Adaptation
When exposed to sudden bright light, the eye adapts quickly—typically within about 10 seconds. However, prolonged exposure to bright light depletes a significant amount of the photochemicals in both rods and cones, reducing the eye's sensitivity to light. As a result, moving quickly from a bright outdoor environment into a dark room can cause a temporary, severe reduction in vision until the eyes have time to adapt to the darkness.
Dark Adaptation
If a person stays in darkness for an extended period, the opposite effect occurs: both the cones and rods gradually become highly sensitive to light. As a result, even very small amounts of light can stimulate the receptors. Dark adaptation takes approximately 7 minutes for the cones and about 30 minutes for the rods.
Eye adaptation to bright light → 10 seconds
Eye adaptation to darkness → 7 minutes for the cones, 30 minutes for the rods
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