Exercises that help increase the strength of eye muscles include covering one eye and steadily focusing on different objects, and following a set movement pattern with the eyes, states WebMD. Another exercise is to concentrate on a single object.
Improve-vision-naturally.com recommends stretching your extraocular muscles by focusing on an object far away. Then, look as far as you can at the top right corner to the bottom left corners of your eye, and then switch sides. The site also mentions a zooming exercise to improve farsightedness. Hold your thumb out at arms length and focus on it, then bring it to within 3 inches of your face, while maintaining focus.