Lenses could prevent eyeball elongation, and deterioration by refocusing light directly into retina.

Myopia, or nearsightedness, affects 41% of Americans, according to a 2009 survey by the National Eye Institute. While this is common and easily remedied with eyeglasses, studies have shown that the problem only grows worse as we age.  Cosmos Magazine, an Australian literary science magazine, explains vision deterioration in this way:

Myopia sufferers see nearby objects clearly but distant objects appear blurred. The condition is usually identified in young children and worsens as the child grows. The poor vision stems from faulty growth in the eye that leads to elongation of the eyeball and steepening of the cornea. If the cornea is too steep, light entering the eye is refracted to point in front of the retina, as opposed to directly onto the retina.

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