How to choose contact lenses? _Contact lenses_

The wearing of contact lenses is becoming more and more common nowadays, and many people also wear contact lenses when needed on some special occasions. When choosing contact lenses, you can’t choose blindly. The specific conditions of your eyes are different. So when you choose, you need to choose according to your own eye conditions and your own living habits, before you can buy more suitable contact lenses. . Let's take a look at how to choose contact lenses. Before wearing contact lenses, relevant eye examinations are required, because some people are not suitable for wearing contact lenses. If you need to correct the power, refraction is also indispensable, but the result of the refraction obtained is only the result of the frame glasses, therefore, the contact lens power conversion is required. In addition, it is necessary to measure the curvature of the cornea. This is because the contact lens must match the curvature of the corneal surface to be comfortable to wear. Therefore, the so-called base curve must be determined. The base curve is very important for the selection of contact lenses. If the cornea of u200bu200bthe eye is flat and the selected contact lens is too tight, the eyes are prone to redness. If it is the tip of the cornea and the lens is relatively wide, it cannot be worn well. We can see that the parameters of the contact lens all indicate the water content. If the water content is higher, the glasses will dry faster, because after the water is evaporated, in order to maintain the water content of the lens, the lens will absorb part from the eye. Moisture also accelerates the dryness of the eyes. If the water content is low, the eyes will not dry easily. Therefore, if there is a lot of tears in the eyes, you can choose contact lenses with high water content. On the contrary, people who are prone to dry eyes are suitable for choosing contact lenses with low water content. The oxygen intake of the cornea comes from the air, so if the oxygen permeability is good, the eyes will not be prone to hypoxia. The choice of lens material is currently better non-ionic materials, which are not easy to absorb protein deposits, and the lenses are also easy to clean. Choice of lens abandonment type. Generally speaking, it is better to discard it for a short time, because if the lens is worn for a long time, the lens needs to be taken care of for a long time, and if the lens is not cleaned, it is easy to cause eye infection. Of course, the choice of the type of use cycle depends on the actual situation of the individual.