Myopia is a common and frequently occurring disease among teenagers. It is mainly due to the improper use of eyes for a long time, leading to excessive eye fatigue, prolonged spasm of the eye ciliary muscle, and continuous increase in the convexity of the lens, which causes blurred vision at a distance.
(1) Blindness-causing: The incidence of myopia in young children is not high, only 3~5%, but once it occurs, more than 95% will become highly myopic. In the early stage, it can cause amblyopia, and later it is mostly manifested as lifelong development. By the time they are in high school, most people can reach above 800 degrees. If left untreated, many cases may lead to complications such as retinal detachment or blindness due to retinal bleeding.
(2) Lifelong Development: There are two factors that cause the progression of myopia: A. The eyeball becomes larger and longer with age, and every additional 1mm is equivalent to an increase of about 300 degrees of myopia. B. Children have strong regulation ability. Long-term close reading, watching TV, playing video games, etc., can cause irreversible changes in the convexity of the lens inside the eye, deepening the degree of myopia.
The development of the eyeball in young children is not yet complete and its working capacity is low. After reading or writing for 0.5~1 hour, you should let the child go outdoors, play games, look into the distance, or observe flowers, green trees, etc., to relax the tense eye muscles and eliminate fatigue. In addition, the child's life should be regular, with sufficient sleep, so that the eyes get full rest.
Do not let children read or write under dim light or sunlight. If a 25-watt bulb is used indoors at night, the distance between the book and the bulb should be within 1 meter. If using a 60-watt bulb, the distance between the book and the bulb should be between 1-2 meters. Under weak light conditions such as cloudy days, twilight, moonlight, or strong sunlight, reading and writing are not suitable. When watching TV, maintain a proper distance, usually 5~7 times the length of the diagonal of the screen. Each session of watching TV should not exceed 2 hours.