Final answer:
Presbyopia is a vision problem associated with aging, in which the lens loses elasticity and the ability to focus on close objects. Corrective lenses are commonly used to correct this problem.
Step-by-step explanation:
Presbyopia is a vision problem associated with aging, in which the eye gradually loses its ability to focus on close objects.
This loss of lens elasticity is believed to be the cause of presbyopia, as the lens becomes less flexible.
As people grow older, the muscles that control the lens may also lose power.
The first signs of presbyopia, such as eyestrain and difficulty seeing in dim light, are usually noticed between the ages of 40 and 50.
Corrective lenses are commonly used to focus on close objects, as surgical procedures for presbyopia have not been as successful as those for other vision problems.