Very responsible approach to the selection of glasses for vision correction. After all, if you incorrectly pick up glasses, your health can be damaged, your vision will deteriorate significantly. To determine the correct parameters of vision, there is a specialist who is called an optometrist. However, in our country there are no such professionals, ophthalmologists themselves are engaged in the selection of glasses. Entrust the selection of such glasses to clinics and offices that enjoy a good reputation, who have all the necessary equipment.
So, if a person has problems with vision, then the question arises: how to choose glasses? After all, 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. The glasses consist of lenses and frames. If you think that it is not difficult to choose glasses for correcting eyesight, we want to dispel your beliefs.
Today many people use lenses instead of glasses, which are put directly on the eye surface under the eyelid. However, these adaptations, and glasses are selected taking into account certain optical indicators. These are dioprs - the main most important data, which 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 index of refraction. Because of what the refractive index will be, depends the curvature and thickness of the lens. Lenses with a high index are easier and less will distort your face and eyes. A stylish and delicate frame for such points is much easier to pick up, and points in this scenario can not only correct the vision, but also serve to create an image.
The material used to make spectacle lenses, too, should be taken into account. Glass or plastic is the main material. However, if the question arises, how to choose glasses, it is impossible to give an unequivocal advantage to neither one nor the other. High-quality modern lenses made of plastic are manufactured with a hardening coating. This kind of coating is as scratch resistant as glass lenses. However, plastic lenses are lighter, since the specific weight of plastic is lighter than that of glass. More plastic is much more resistant to its splitting, and plastic fragments are not as dangerous as glass. Consequently, glasses with plastic lenses are not as traumatic as their counterparts from glass.
The positive properties of glass lenses is the fact that their refractive index is higher and the strength is higher. From this it follows that glass lenses may well be more flat and thin. But plastic has a greater ability to dye lenses.
A special technology that significantly improves the optical properties of a lens is called an anti-reflective coating. It increases the transparency of the spectacle lens by 8 to 10 percent. Lenses with such a coating cause less fatigue with the load on the visual apparatus and will be much more comfortable for your eyes. In addition, if you are driving during the dark period, spectacle lenses with anti-reflex will allow you to see better. Of course, you can draw an important conclusion that you should start choosing glasses to correct your eyesight with the selection of lenses, especially if you need to correct enough serious violations.
And more should be considered when the problem arises, how to choose glasses, such an important component as the frame. Here it is necessary to pay close attention to the mobility of the nose pads. If they are tough, they will press on the bridge of the nose and cause fatigue. The frame with silicone movable nose pads is the best option. You should know that the size of the temples should match the distance from the rim to the bulge behind the shell of the ears. A comfortable frame will not cause fatigue with prolonged wearing. The frame, unfortunately, can be the cause of an allergic reaction, so its choice should be treated with responsibility.
Taking into account all these factors, everyone can make the right choice of glasses, which very soon become not just an adaptation for you, but a part of the body, your real second eyes.