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Presbyopia


 

The condition known as Presbyopia, as a rule, makes itself felt at an age in the early or middle forties. The remedy is to wear bifocal, trifocal or progressive lenses to provide the additional power hitherto supplied by natural accommodation. A less common solution today is to provide separate distance and reading spectacles.

PRESBYOPIA is not really a defect at all, but the normal process of growing older. Throughout our normal life our bodies are producing cells which eventually die and new cells grow to replace the old. Take as an example your skin, each day skin cells die and fall off our body. This is most noticeable after having a bath and new skin cells are grown to replace the lost ones.

This process also applies to a certain extent to the special cells that make up the crystalline lens in our eye, however in the case of the crystalline lens, these cells are retained within the lens which has the result of making the lens denser. This makes it more difficult for the muscles controlling the lens which normally assists the focusing ability of the eye to alter the power of the lens. From a vision point of view, this has a similar effect to that experianced in long-sightedness, in that the eye can see quite well in the distance but not too well in close up work.

An example of this is that at some time we must all have seen someone trying to read a menu or a newspaper at arms length, this is done because the point of focus of that person has in effect moved further away from its original point. To correct this we must treat it as long-sightedness, and the optician would prescribe a plus powered lens to assist the eye to re-focus again at close distances.

Also see:- Retiring with good vision

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