Especially since television and computers have come along, the number of people with sight problems has exploded. Like with any other muscle, you can train your eyes to maintain and improve you eyesight.
The best product Healfi has found so far is Rebuild Your Vision, but science still has a lot of work in order to better understand vision problems and to help people get rid of their glasses.
The Rebuild Your Vision program is based on the "Bates' Method": The Bates Method for Better Eyesight Without Glasses. Another good book is Seeing Without Glasses
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Healfi is convinced that blindness can be cured, but does not think the solution is only in the eye, but also in diet, sleep, sun, positive thinking, etc., ... With some serious lateral thinking and a future better understanding of general health, it will just be a question of time until research finds a solution to blindness.