Is the light off at night and reading a book on the desk lamp is harmful to the eyes?
When artificial light sources are used for lighting, the greater the brightness contrast between the indoor environment and the working surface, the more likely it is to cause visual fatigue.
Therefore, if you read in a dark room with only one desk lamp, only the books at close range will be illuminated in the field of vision, and the surrounding environment will be completely dark. The tension and compression state of looking close can easily accumulate eye fatigue and cause "light source myopia". At the same time, short-range strong light causes light retention on the human retina, especially when sleeping after studying, it will tighten the eye muscles, affect the effect of sleep to relieve eye fatigue, and accelerate the decline of vision.
It is harmful~ For this reason, when using desk lamps to illuminate, a small light should be turned on in the room to reduce the difference between indoor brightness and darkness.
