My uncle once told me "the real reason myopia happens because you look at a PC monitor non stop for hours. When you look to the same object for hours, the eye muscles gets used to the focusing close objects and since they bend the eyes exactly the same for long periods the eye itself changes its shape so look to the distant mountains regularly and blink your eyes so your eyeballs will be wet"
It sounds somewhat illogical but the myopia illustrations on the web shows eyes with faulty lenses And oval shaped eyeballs.
In short, is he true? Does long periods of gaming etc cause myopia?