What are glasses for?

Remember the famous fable of Krylov about the monkey andglasses? As it turns out, to perceive it in a figurative sense is not always necessary, because there are many people who do not know how to correctly use glasses. And on the topic of what glasses are for, we'll talk today. In addition to the usual glasses for vision correction, we will also consider solar and some others.

Why do I need glasses

If you have short-sightedness or farsightednessthere is, badly see in the distance or near), the glasses help to correct the focus of the eye in such a way that the eye will perceive objects in the same way as in normal vision. This is achieved with the help of lenses. In the case of myopia, concave or scattering lenses are used, and for correction of hyperopia, convex or collective. The degree of concavity or convexity of lenses is the stronger, the more the focus of vision is broken in one direction or another.

Do I need to wear glasses

Very often the timely use of glasseshelps to stop the progressing myopia. The fact is that if a person does not see well in the distance, then every time he wants to see something, he has to strain. And the stronger myopia, the greater the tension, and the tension leads to the fact that the eyes are tired more and more, and, accordingly, there is a further deterioration in vision. The glasses also help to relieve tension from the eyes and, thus, stop the process of deterioration of vision. Do I need to wear glasses constantly? This question can only be answered by a doctor. Often with myopia, you can wear glasses only when you are watching TV, reading or working on a computer. Points for the computer are needed for those who spend a lot of time behind it - because today the activities of many employees are connected with the use of a PC.

Glasses for children

Many parents ask if a child is neededglasses if the problem with vision is not too serious. The best option will be an appeal to the oculist. We will note that the use of glasses can not only significantly slow down, but even stop children's myopia. It also happens that those people who in their childhood wore glasses, vision ceased to deteriorate and even recovered. If the child is embarrassed to wear glasses, then you need to convince him that modern glasses are so diverse that finding them beautiful and stylish is absolutely no problem, especially since it's true.

Sunglasses

There are different opinions about how muchSolar ultraviolet radiation can affect our vision. Someone beats an alarm and says that eyes need to be protected, someone, on the contrary, speaks about the harm of sunglasses. Here we can say this: it is unreasonable to refuse such protection of the eyes in the bright midday sun of the summer, since UV radiation during this period is so strong that it can easily have a negative effect on the lens of the eye. At the same time, wearing sunglasses is almost always more harmful. In this case, even ordinary daylight can become irritating to the eye. It's no secret that those who wear sunglasses without removing, the risk of eye diseases increases at times. Therefore, use sunglasses in the summer in the daytime and for protection from the sun, and to protect the eyes from sand and dust. As for the models of such glasses, it is necessary to choose glasses with a filter, so cheap models should be immediately discarded, since toning alone is not only useless, but even harmful for the eyes.

Other types of glasses

First of all, it is, of course, protective glasses,which are designed to protect the eyes from chemical, thermal, light and mechanical influences. One of the special types of safety glasses we have already considered is sun protection. And there are also plastic glasses to protect the eyes from mechanical damage (for example, when working on a machine), glasses with filters to protect the eyes from bright radiation. This is necessary, for example, when welding, when working with lasers, etc. For glass blowing and metallurgy, protective glasses are used against thermal effects, and in the chemical industry they use spectacles that are close to the eye sockets, to protect them from various reagents. There are also safety glasses for working in water. One type of sunglasses are the colored glasses invented by the Chinese. To drive a car, some use polarized glasses that significantly reduce glare from various objects. Perforated or perforated glasses allow you to correct myopia, but doctors do not recommend wearing them permanently. In addition, such glasses, as well as some types of sunscreen, are used to protect against dazzling snow in winter.