Very responsible should approach the choice of glasses for vision correction. After all, if you choose the wrong glasses, then your health can be harmed, your eyesight will deteriorate significantly . To determine the correct parameters of vision, there is a specialist called optometrist. However, in our country there are no such professionals, ophthalmologists themselves are involved in the selection of glasses. Entrust the selection of such glasses to clinics and cabinets that enjoy a good reputation, which have all the necessary equipment.
So, if a person has vision problems, then the question arises before him: how to choose glasses? Indeed, it is this optical device that will help to eliminate them, and in some cases even improve the ability to see to such an extent that the patient will soon be able to do without them. Glasses made of lenses and frames. If you think that it’s not difficult to choose glasses for vision correction, we want to dispel your beliefs.
Today, many instead of glasses use lenses that are worn directly on the eye surface under the eyelid. However, both these devices and glasses are selected taking into account certain optical indicators. These are diopters - the main most important data that anyone who thinks about how to choose glasses should know. Additionally, if you do not want to bother with lenses, you need to calculate the center-to-center eye distance. Usually all this is reported to the patient by an ophthalmologist.
Another important parameter that should be considered when choosing such an important accessory is the refractive index. After all, the curvature and thickness of the lens depends on what the refractive index will be. High index lenses will make your face and eyes less easily and less distorted. It is much easier to choose a stylish and thin frame for such glasses, and glasses in this situation can not only correct vision, but also serve to create an image.
The material used to make spectacle lenses should also be taken into account. Glass or plastic is the main material. However, if the question arises, how to choose points, it is impossible to unequivocally give an advantage to either one or the other. High-quality modern plastic lenses are produced with a hardening coating. This type of coating is as scratch resistant as glass lenses. However, plastic lenses are lighter since the specific gravity of the plastic is lighter than that of glass. Plastic also has a much greater resistance to cracking, and plastic fragments are not as dangerous as glass ones. Therefore, glasses with plastic lenses are not as traumatic as their counterparts in glass.
The positive properties of glass lenses are the fact that their refractive index is higher and their strength is higher. It follows from this that glass lenses may well be flatter and thinner. But plastic has a greater ability to tint lenses.
A special technology that significantly improves the optical properties of the lens is called anti-reflex coating. It increases the transparency of a spectacle lens by 8 to 10 percent. Lenses with this coating cause less fatigue under loads on the visual apparatus and will be much more comfortable for your eyes. In addition, if you are driving in the dark, then spectacle lenses with anti-reflex will allow you to see better.
Of course, it is possible to draw an important conclusion that the selection of glasses for vision correction should begin with the selection of lenses, especially if correction of sufficiently serious violations is necessary.
And still it is necessary to consider at the arisen problem how to choose glasses, such an important component, as a frame. Here it is necessary to pay close attention to the mobility of nose pads. If they are tough, they will put pressure on the bridge of the nose and cause fatigue. A frame with silicone movable nose pads is the best option. You should know that the size of the earhooks should correspond to the distance from the rim to the bulge behind the shell of the ears. A convenient frame will not cause fatigue during prolonged wear. The frame, unfortunately, can be the cause of an allergic reaction, so its choice must be treated with responsibility.
Given all these factors, everyone will be able to make the right choice of glasses, which very soon will become not just an adaptation for you, but a part of the body, your real second eyes.