Exposure to bright light is the key factor. It is especially important during childhood, when the eyes are still growing and developing. Once elongation of the

Exposure to bright light is the key factor. It is especially important during childhood, when the eyes are still growing and developing. Once elongation of the eyeballs sets in during childhood and the teen years, there is generally very little (if anything) that can be done about it in adulthood. Adults' eyes do not change shape very much after a certain age. So-called "eye exercises" of the future will probably look something like having children look at bright lights or spend time outside in sunlight for some period of time each day.