The number of people suffering from various vision problems continues to increase from one year to the next. Some statistics indicate that vision is impaired to one degree or another in almost ninety percent of people. The causes of visual impairment are many and varied. This is frequent sitting at a computer monitor and books, watching TV, improper vision hygiene, hereditary predisposition and much more.
If earlier glasses were used for non-surgical vision correction , now a modern person increasingly prefers contact lenses for eyes as an alternative to them. The selection of contact lenses is extremely important, since it depends on how a person will feel in them and how well they see.
Fitting contact lenses – determining the type
In essence, contact lenses are the same glasses, only made not of glass, but of polymer materials that are able to absorb water. The latter property of contact lenses protects them from drying out, preventing the cornea of the eye from drying out. Contact lenses are not equipped with frames, as they are fixed on the surface of the eyeball. The back of the corrective lenses exactly follows the shape of the eyeball, so the selection of contact lenses is carried out in an individual form. The structure of the lens makes it possible for it to adhere to the eye shell as tightly as possible. The external side is obliged to ensure the correct focus of light rays penetrating the human organ of vision.
Among all modern lenses, most often a person chooses soft corrective lenses. Rigid corrective lenses are prescribed for severe vision pathologies and are much less popular.
Soft corrective lenses are subdivided into regular and planned replacement lenses. The first type of lenses is used for a month, then there is a need for special cleaning. And lenses that are replaced on a planned basis do not need special care. After a certain time, they are thrown away, acquiring new ones.
There are also such types of corrective lenses as cosmetic. These lenses also help to establish normal vision, but, in addition, they are able to change the color of the eyes, their shade and even the shape of the pupil, for example, to make it feline.
Fitting contact lenses
Fitting contact lenses begins with a visit to a qualified ophthalmologist. Many eye optics salons provide an examination service with an ophthalmologist in their salon, that is, the specialist will determine the distortion of vision on the spot and select the lenses. But some dishonest companies can deliberately force to buy, for example, the most expensive lenses, although this was not necessary. Therefore, it is better to visit a trusted specialist in advance who will advise the best way to correct vision.
After fitting contact lenses, depending on your vision, you should find out how best to wear the lenses. That is, you can choose lenses that will be removed at night and treated with a special tool, or they will be lenses of planned replacement, which, although they have a high cost, require less whimsical care. At the same time, you can wear the latter without taking off for several months.
The selection of contact lenses, as already mentioned, is carried out strictly on an individual basis. The selection takes into account – diopter indices, while for each eye they can be different, the strength of the curvature of the cornea and the diameter of the contact lens. The markings are written on the lens packaging: DIA – lens diametric indicators, D – diopter power, BC – corneal curvature.