Did you know your eye muscles can be trained?

Each of our eyes is controlled by six muscles (called the extraocular muscles) which work together to create the movements of the eyeball. These muscles work in the same way as any other skeletal muscles, such as your hamstrings or your biceps, in that they adapt to the stresses and strains that are put upon them; in other words, they respond to training! The eye muscles are already as strong as they need to be (our eye-balls are not getting any heavier!), but we can train them to work faster, more efficiently, in better coordination with each other. We can also improve their stamina so that they can work for longer periods of time without getting fatigued.

How Exercising helps your vision.