Why do some people stay up late every night to play with their phones or read novels but not short-sighted?
Some people stay up late every night to play with their mobile phones or read novels but are not short-sighted. The occurrence of nearsightedness is related to genetics, environment, lifestyle and other factors. Hereditary factors are an important factor in causing short-sightedness. If both parents are short-sighted, the risk of children suffering from short-sightedness will be relatively high. The environmental factors were also an important factor in causing shortsightedness. For example, long-term close-up viewing of electronic screens, reading, writing, and other fine visual activities could easily cause eye fatigue and lead to shortsightedness. In addition, lifestyle can also affect the occurrence of shortsightedness. For example, staying up late for a long time, lack of exercise, unhealthy diet and other unhealthy lifestyle will increase the risk of shortsightedness. Therefore, although staying up late to play with mobile phones or read novels every day may increase the risk of eye fatigue, it does not necessarily lead to shortsightedness. Some people might not be short-sighted because they inherited good eyesight genes and had a healthy lifestyle.