Presbyopia is a development that can be explained by the increasing difficulty or inability to see things up close as a person ages.
Suddenly, you can only read the newspaper or restaurant menus by holding them at arm's length, at the cost of effort and eye strain.
The eye'scrystalline lens is a kind of lens that enables us to focus and bring objects into image focus. Unfortunately, from the age of 40 onwards, the crystalline lens loses its flexibility and no longer bulges sufficiently to bring objects into focus.
The eye no longer perceives close-up objects clearly and accurately. Images are blurred. The near image is formed at the back of the retina. The result is increasing difficulty in seeing up close.