Improve Your Eyesight: A Guide to the Bates Method for Better Eyesight Without Glasses

One unique offering is his explaining how there are two ways for the brain to block the visual process. One is to interfere with the mechanics of vision, by altering the eye shape with the extrinsic muscles, preventing proper blinking and shifting, and encouraging disease that impairs vision. The other way is what Barnes refers to as altering the consistency of the barrier between the subconscious and conscious mind. The first type of blocking (mechanical) tends to be more easily overcome than the second. The second is purely mental, when there is clear information that has made it through the visual system but it isn't recognized for what it is. So there are times when the eyes are working in an improved manner, but their signals are prevented from passing through the barrier (from the subconscious to conscious mind).

That actually just summarizes one page, and the rest of the book is relatively simple. But if you're new to the Bates Method, read this text slowly, as you are going to miss important principles he slips in if you aren't careful.