Your eyes need exercise just like any other muscle, especially in this day of pollution, television, driving and computers. I am a great believer in exercising my eyes. Like a camera or a pair of binoculars when you adjust the focusing mechanism. I like to exercise my eyes by changing my focus on various objects. Maybe it's my restless nature. I can't sit still for long and I constantly want to look around me, observe and learn. Could be my French heritage, or is it the fact that I feel so energetic and good about myself I just want to explore? Anyways, I use this characteristic of mine to exercise my eyes.
How do I do it? I grab a book with fine print (a telephone book will do, although with everyone owning a computer, I don't know how long the telephone company will continue to print books). Start by focusing on the small print, and then slowly bring the book up close to your face endeavoring to focus as it comes up to your nose. Oops! Now the Jones' and Smiths are really getting jumbled. Then quick as a flash I look out the window beyond Santa Monica, and try to focus on a sailboat way out near the horizon. Repeat this experiment several times a week. Look at objects up close and way out. And from distance again to up close.
This practice has enabled me to see clearly without glasses since I was in my teens, at which time the only focusing I did was at the candy counter at the corner store. I believe focusing the eyes to be a very useful eye-strenghthening exercise. However, the practice is only recommended for healthy eyes. If you have eye problems then your first course for action is to consult your eye doctor. He's the real professional, fully trained to treat abnormal eye conditions.