Presbyopia, from the greek presbys (πρέσβυς) which means old and op (οπ-), the root of the terms relating to the view, it is a natural phenomenon that occurs around the age of 40. All individuals of both sexes after this age become presbyopic.
This phenomenon occurs earlier in hyperopic and astigmatic individuals and in less evident way, in the short-sighted people. In the eye there is a lens called crystalline. In the child and the young in the absence of disease this lens allows you to see clearly both at a distance and close as the accommodation mechanism of natural focus, allows precise focus images on the retina. Around the age of 40, presbyopia starts a little at a time to show up making it progressively more difficult to read at close distance.
Presbyopia is not a disease, but it is the physiological and, therefore, natural evolution of the eye over the years. With the loss of elasticity of the lens of the reading is more difficult and it is customary gesture to stretch your arms to be able to distinguish clearly written words. The slow progression of the phenomenon makes it necessary after a number of years, the increase of the power of the glasses for near.
Around 65 years there is a stabilization of the phenomenon. Main symptom of presbyopia is the difficulty of reading which is associated with other disorders such as visual fatigue in prolonged reading, the doubling of letters, redness of the eyes, mild heartburn and even headaches.
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