When we enter from bright sunlight to a dark room, we cannot see initially, why?

When we are in bright sunlight, the iris of our eyes adjust the pupil in such a way that less light enter our eyes (i.e. the pupil shrinks). But, when we enter a dark room, the iris needs to adjust the pupil in such a way that more light enter our eyes (i.e. the pupil needs to be enlarged). This is because we cannot see anything in a dark room if less light enter our eyes. The adjustment of pupil takes time. So, when we enter from bright sunlight to a dark room, we cannot see initially.

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hello valentina,

                           this is bcoz...in bright sunlight the pupil of our eye is small so when we enter in a dark room very little light enters our eye...and we cannot see properly..initially!!!

  • -4

When we enter from bright sunlight to a dark room ,, the rod cells in our eye takes little time to adjust itself with the intensity of the light.

Thus we are not able to see  initially../

  • 2

There is a slight correction in my answer. Please refer to this one: 

When we are in bright sunlight, the iris of our eyes adjust the pupil in such a way that less light enter our eyes (i.e. the pupil shrinks). But, when we enter a dark room, the iris needs to adjust the pupil in such a way that more light enter our eyes (i.e. the pupil needs to be enlarged). This is because we cannot see anything in a dark room if less light enter our eyes. The adjustment of pupil takes time. So, when we enter from bright sunlight to a dark room, we cannot see initially.

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