The biggest harm for children to play electronic products is not myopia. To put it bluntly, when a child is found to have ADHD after entering school, he is prone to get angry and lose his temper, forget words, do problems carelessly, have poor memory, have unpleasant speech, have poor coordination, are clingy and withdrawn, not necessarily because the child is disobedient or stupid, but because he plays electronic products improperly at an early age, which has caused developmental disorders of the brain and nervous system.