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

Make sure your kids spend time doing mid range and far range activities. I try to get the kids outside for a little bit every day - for various reasons, but eye sight is one of them. Even a walk, and looking at the plants and critters in the neighbourhood is good. Another good habit to cultivate is sunglasses. Cataracts run in my family, and sunglasses are preventative.