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myopia are not all equal, three Contraindications

The Myopia is a visual defect that affects almost one person in three in the world. But what

caused by what is and what are the causes? what's the problem?

To answer these questions just think that the light rays coming from infinity (so called parallel) are focused in front of the retina, because the refractive power of the eyepiece diopter is excessive in relation to the length of the bulb. I have therefore over-convergence (dioptric power greater).

From a purely medical myopia can be of three types: simple, intermediate or pathological . Myopia is simple queslla that raises fewer problems because it does not exceed 3 diotttrie and above does not present any alteration from the point of view of the retina.

If you exceed the 3 diopters we enter the second phase of myopia intermediate which generally does not exceed 7 diopters, is obviously more important as a kind of myopia, but no serious damage to the cornea.

Serious damage instead presents them to the cornea of \u200b\u200ba patient afflicted with pathological or degenerative myopia is almost inevitably associated with lesions of the sclera.

To resolve the short-sightedness is needed to refractive surgery. The introduction of phakic lenses can solve even the most severe cases of myopia.