iPad kills children 's eyes

In this trendy society, more and more children and students are addicted to study with iPad, such as reading story, playing games. They become iPad controller day by day, so that impaired vision becomes big problem to them and their parents. How to avoid this issue? Parents should supervise their child to use iPad reasonably, such as time of using ipad not too long, and taking some action to protect children's eyes after long time iPad reading or playing. Using other study ways are good choices.