As people get older, usually in their early forties, a condition called presbyopia sets in. Presbyopia is the inability to focus on objects near the eye. One usually notices that it is harder to read or use the computer. Bifocals or reading glasses are a way to remedy this condition; there are also surgical options like corneal inlays and multifocal intraocular lenses.
Presbyopia is a natural consequence of the aging process. There is no way to avoid it and no known cure, though researchers are constantly looking for one. Even if someone has never had vision problems before, he/she can still develop presbyopia. It may seem to occur suddenly, but it actually occurs over a long period of time. Symptoms include having to hold things at arm’s length to see them clearly, eye strain, fatigue, and headaches from near work.
Hyperopes will notice reading difficulty at a slightly earlier age, myopes may not complain as early due to the ability to read effectively without their glasses.