Presbyopia is a change in visual ability that occurs with age, from about 40 years, and looks like trouble seeing up close. The cause of presbyopia is the progressive inability of the eye lens (“crystal”) to change shape (“accommodative amplitude”) to focus, due to its lower elasticity. The next graph represents the decrease in accommodative amplitude in relation to age.
The phenomenon affects all alike, although with different intensity and speed. Hyperopia and astigmatism are the earliest, in presbyopia, while in the short-sighted it is manifested in a less obvious. Continue reading
