Question

Why does one feel blinded for a short while coming out of a dark room?

Answer 1

Retina:

1. The innermost of the human eyes is the retina.
2. There are two types of pigmented cells are present in this layer- the rod cells and the cone cells.

Rod cells:

1. They are elongated or rod-shaped.
2. They are more active in low light.
3. They contain the pigment rhodopsin.
4. Rod cell generally forms black and white vision.

Cone cells:

1. These cells are cone-shaped.
2. They are capable of absorbing high-intensity light.
3. They help us to see objects in bright light.
4. They contain the pigment iodopsin.
5. They are responsible for color vision.

The reason why does one feel blinded for a short while coming out of a dark room:

1. In the darkroom, the rod cells in the retina of the human eye get activated and rhodopsin is synthesized.
2. Coming out from the darkroom to the bright light, the rhodopsins is dissociated into retinin and opsin protein and iodopsin take some time to be synthesized in the cone cells of the retina.
3. In the darkroom, the pupils of the eyes get dilated but with the sudden exposure to bright light(outside of the darkroom) they take some time to constrict.
4. Pupils control the light entering the eyes. When someone comes out of the darkroom the maximum amount of light enters his/her eyes and makes him blinded for a few seconds.
5. The above causes are the main reasons for one feeling blinded for a short while coming out of a dark room.