Presbyopia is a naturally evolving process where it becomes increasingly difficult to see clearly up close as one ages.
Suddenly, reading a newspaper or a menu becomes difficult unless one holds it at arm's length — often with great difficulty and visual fatigue as a result.
The eye lens, the so-called crystalline, functions as a natural lens that makes it possible to focus and project images onto the retina. However, from the age of about 40, this lens gradually loses its suppleness and flexibility. It can no longer bulge sufficiently to focus properly on nearby objects.
The result is that the eye no longer sees nearby objects sharply and clearly. The images become blurred, because the focus falls behind the retina. This leads to increasing difficulties in seeing up close.