What are some of the bad habits which affect kids' (3-8 yrs) eyesight? How can parents ensure good eyesight for children.

Just to add up, I think, portable game consoles like Game Boy and PSP also affect kids' eyesight due to close distance. If you can't take these consoles away from your kids, I suggest to strictly enforce a time limit in using them.

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too much electronic gadget, lyind down to watch tv, watching gadget/ tv in dark .