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Long-Sightedness corresponds to the loss of the accommodation which is the adjustment, between the vision by far and the vision of near, permitted by the muscles intraocular operating the crystalline lens.

Long-Sightedness appears as from approximately 40 years. Initially, it is necessary to move away the text to be read, and then the vision of the details becomes impossible without an adapted correction.

Long-Sightedness thus requires the port of a correction in vision of close different from the correction by far (glasses various, double hearths, progressive glasses or lenses of contact multifocales).

There is no treatment for the loss of accommodation of the crystalline. Current treatment of presbyopia involves two elements:

- Monovision: the principle is to set the dominant eye for distance vision and the eye directed (non-dominant) for near vision. This method is very efficient if the difference between the eyes is less than one diopter.:

- Changing the corneal asphericity.
The latest developments of Excimer Laser used to modify the corneal asphericity, enabling increased depth of field.

Both approaches, monovision and modified corneal asphericity to compensate effectively for presbyopia distance vision and near. It is often necessary, after 50 years, adding a correction (magnifier reading) very close to the vision.