If you read a book under strong light for a long time, your pupils will shrink continuously, causing eye muscle fatigue, eye pain and even dizziness. In addition, because the light is too dazzling, you will feel that there is a light in front of you, which will last for a long time. When you see it, it will shine there. This is the afterimage effect of macular region of retina stimulated by strong light. Of course not. Reading in strong light for a long time, due to excessive adjustment of ciliary muscles, will not only promote the development of myopia, but also damage the retina, reduce visual sensitivity and cause permanent decline.
When the eyes are exposed to strong light, the pupils will shrink, but if they are exposed to strong light for a long time, the pupils will also shrink. After a long time, it will cause eye muscle spasm, eye edema, dizziness and other discomfort. Too strong light will seriously stimulate the eyes and blur the vision. Reading in strong sunlight for a long time can also cause damage to cornea and lens, so you must pay attention to protecting your eyes when the light is strong.