Causes of myopia

Heredity and myopia8915330_s
Studies showed if parents are myopic, their children would have 2 to 4 times higher risk of getting myopic.

Outdoor activities and myopia
Studies showed that increasing the time of outdoor activity would reduce the chance of having myopia. It is suggested that children would be better having outdoor activities more then 2 hours per day. However, it is not easy for Hong Kong children as their leisure times are occupied by studying and doing homework.

Electronic visual devices and myopia
It is general believed that there is a relation between long-term using electronic mobile device and myopia development.

Lighting and myopia
Animal studies showed dim background lighting will cause fast progression of myopia.