The most common problems
The term ametropia refers to a condition when the image does not form correctly on the retina. Ametropia is blurred vision which requires optical correction. There are three kinds of eyesight problems:
And nobody escapes presbyopia after the age of 40, when natural aging of the crystalline lens results in blurred near-sight.
One in five people in the world wear glasses. The problems listed above are very common, although others exist, including amblyopia, strabismus and low vision