Visual training optometrists differ in specific practices, but have underlying beliefs in common:

Sight and vision are different. Sight is "merely" seeing, but vision involves "synthesizing, unifying and understanding what is seen" and this occurs mainly in the brain.

Vision is a "learned process" that can be taught. Not everyone, however, with poor eyesight needs training. Most people learn to adjust with glasses.

Poor vision is not necessarily inherited from one's parents, although a predisposition may be. In most cases, it is caused by environmental factor such as poor lighting, bad posture, too much close work, such as reading, and stress.

"Ninety-five percent of all visual problems are stress-induced," claims Dr. Stanley A. Appelbaum.

Conventional optometrists measure your eyes and "Lock you in at that moment" with glasses that may be meant for only one purpose, but are used all day for everything, says Applebaum. Visual training develops the eyes, much as physical therapy develops muscles of polio victims who used to be placed in a brace, says Dr. Harold S. Glazier, a Bethesda optometrist.

Vision and posture are related.

While some of the exercises may be done at home, visual training is not a do-it-yourself technique.