ADULT MYOPIA 2017-11-07T10:11:51+00:00

SCIENTIFIC RESEARCH

Adult myopia

WHAT IS IT ABOUT AND HOW TO RECOGNIZE IT

A fundamental characteristic of the eye, as an optic system, is the ability to modify its feature depending on the distance of the object observed, in such a way that the image is always formed on the retina (accommodation).

MYOPIA , or Nearsightedness, is an ocular abnormality due to an ocular bulb longer than normal. This results in a shift of focus in front of the retina with consequent difficulty in the distance vision and other retinal problems, especially in cases of high or degenerative myopia.

The latter it is not only a refractive error but a form that gives rise to serious hereditary fundus changes. It is linked to the heavily abnormal size of the eye, which could reach a length of 30 mm (circa 1.2 inches). It starts precociously, around 2-3 years; in general, at the first exam is found a 5-6 diopters myopia with some alteration of the fundus. The retina appears stretched, thinned, with zones of atrophy and pigmentary alteration. These alterations have to be controlled regularly to prevent complications.

In Nearsightedness, the elongated shape of the eyeball involves a continuous traction of the retinal tissues with a reduction of the volume of the capillaries. For this reason, you can notice an alteration of retinal metabolism and tissue degeneration, caused by hypoxia .

There is also a chronic oxidative stress caused by the increase of free radicals or by a low antioxidant capacity. This phenomenon is at the center of the pathologies associated with myopia: hypoxia with induction of formation of new blood vessels, cataract, floaters, the detachment of the vitreous and retina.

Nei miopi la conformazione allungata del bulbo oculare comporta una continua trazione dei tessuti retinici con una riduzione del volume dei capillari. Per questo motivo si assiste ad un’alterazione del metabolismo retinico e degenerazione dei tessuti, causata da ipossia.

Si nota inoltre una situazione di stress ossidativo cronico causato dall’aumento della produzione di radicali liberi o da una ridotta capacità antiossidante. Questo fenomeno è al centro delle patologie associate alla miopia: ipossia con induzione della formazione di nuovi vasi sanguigni, cataratta, mosche volanti, distacco del vitreo e della retina.

ADVICE

In these cases, is recommended an adjuvant treatment with vasoprotectors and supporting microcirculation supplements.

FURTHER INFORMATION

To prevent visual stress, read our tips.

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