When a person enters dark room from bright light he can not see anything clearly for sometime and starts seeing slowly because?

When a person enters a dark room from bright light, they experience temporary night blindness. This is because the eyes need time to adjust to the sudden change in light levels. When exposed to bright light, the pupil of the eye constricts to reduce the amount of light entering the eye. When the person enters the dark room, the pupil needs to dilate (enlarge) to allow more light to enter the eye. This process takes a few minutes, during which time the person may have difficulty seeing clearly.

In addition, the retina of the eye contains two types of photoreceptor cells: rods and cones. Cones are responsible for colour vision and work best in bright light conditions, while rods are responsible for night vision and work best in low light conditions. When the person enters the dark room, the cones stop working effectively, and the rods take over. The rods are less sensitive to light than the cones, so it takes longer for the person to see clearly in the dark.

Some tips for adapting to dark rooms more quickly include:

1. Avoid looking directly at bright lights before entering the dark room.

2. Give your eyes a few minutes to adjust to the darkness.

3. If possible, use a dimmer light when entering the dark room.