The digital era, which is confidently marching around the planet, has led to the fact that humanity began to work with objects in the immediate vicinity of them. A computer, digitizer, or even an exact instrument forces our eyes to function exclusively in one mode, which is not entirely provided for by nature, and they may need correction. Usually it is made using contact lenses or glasses that have a specific unit in their optical power. It is called "diopter." What this value measures is not at all difficult to find out. The ability to focus light rays at a single point, a unit of distance, after they cross a convex lens.
Natural Magnifier
Such a natural lens in the human eye is the lens and other translucent media, it is able to change its size, and depending on the intensity, its optical power is from 57-59 to 70-70.5 m -1 (as diopter is designated). What does this mean in practice? The natural lens of the eye focuses the rays at a distance of 1/57 to 1 / 70.5 meters due to a change in the curvature and size of the lens, it produces an image on the retina. If the size of the eyeball is enlarged or reduced in the longitudinal direction, this leads to an incorrect display. In the first case, called myopia, due to the increase in distance, focusing occurs earlier than necessary. In the second, everything is diametrically opposite: hyperopia of the eye causes insufficient space for image formation, and it forms already behind the projection screen of the eye - the retina.
Selection of vision correction
In this case, a reasonable decision would be to contact an ophthalmologist who can examine the fundus and select the necessary accessory in accordance with your vision, a diopter table is used for diagnosis by specialists. It reflects the relationship between changes in the eye and the refractive power of glasses. To do this, lenses with the necessary values, scattering or focusing, are used, and the necessary positive or negative value of the optical power of the lens is determined from the Sivtsev table (its measure is determined by the diopter). What does this give the patient? He can now clearly track the value of his “plus” or “minus” and always get advice and the necessary adjustment. But the use of contact lenses or glasses helps not only improve the ability of the eye to focus (for example, -1 diopter). That this is important is beyond doubt. You can also use colored contact lenses to change the appearance or glasses with ordinary glasses and an expensive frame to look older. But you should not choose optics yourself even as an accessory, because there are many parameters, for example, the radius of curvature of the lens, the transmitted light flux, UV protection and other conditions that can only be measured by specialists. After examinations, the owner will be able to comfortably and safely wear glasses or contact lenses.
Healthy eyes without complaints
After examinations, the owner will be able to comfortably and safely wear glasses or contact lenses. With small deviations of vision from the norm, ± 1 diopter optics may not be required. But if the values are larger, it is better to reduce the lens power by 0.5-1 m -1 , in which case the eyes will not be overly tired or degrade from idleness. After all, maintaining your vigilant friends in good shape is the key to healthy eyesight in general.