Question

Why do humans feel some discomfort when they move suddenly from a dark area to light?

Answer 1

Why do humans feel some discomfort when they move suddenly from a dark area to light ?

Transitioning from a dark place to an well lit environment can spark this sensation, primarily due to the dilation of the pupils. Fortunately, this is almost always temporary until your eyes adjust to the new level of light. When we enter into a dark room from a very bright place, we experience difficulty in vision. This change is due to regeneration of rhodopsin, the pigment of the rods, which was earlier broken down due to bright light and even the size of the pupil is less in the bright light. After sometimes the vision gets restored by regeneration of rod cells and dilation of the pupil in the dark which permits more light to enter the eyes. Rod cells are the cells which help in dim light vision.