What is presbyopia?
Presbyopia is not a visual defect but a natural change in vision which affects everyone. Over time the crystalline lens loses some of its suppleness and therefore its ability to bulge out and focus. The effects of this change are generally felt around the age of 40. Like a badly adjusted camera, the eye no longer focuses the image correctly. For emmetropic presbyopes (those who do not have any trouble seeing things far away) or ametropic presbyopes corrected for distance vision, the difficulty is seeing things close up.
- Simple reading glasses are the basic solution. They only correct near vision, around 40cm away. To see things far away, you need to remove your glasses or look over them.
- Mid-distance lenses are the intermediate solution. These allow you to see clearly close-up and with a wider field of vision. With this type of lens it is possible to read a newspaper while being able to see those around you clearly.
- Progressive lenses are the optimum solution. These are designed to restore clear and accurate vision at all distances, without needing to constantly change glasses. The upper part of the lens makes it possible to see things far away, the central part to see the middle distance and the lower part to see close up.