Question

When we enter into a dark room our vision is impaired for few seconds. Why does this happen?

• A. We cannot see in the dark room.
• B. Our eye shifts the retina closer to our eye lens to form the image correctly.
• C. Pupil takes time to adjust.
• D. Rods and cones are ineffective in dark.

Answer 1

The correct option is C

Pupil takes time to adjust.

When we are in bright light the pupil contracts to allow an adequate amount of light sufficient for visibility but as we enter a dark room the amount of light passing through the pupil is not sufficient to assist visibility, hence our pupil expands. This adjustment takes some time.