Today, colored lenses, black is not only an object for vision correction, but also a stylish accessory. However, even before the mid-90s, contact or scleral lenses were not so widely available.
Initially, this type of optics was developed for people suffering from increased sensitivity of the eye. To this day, with diseases such as microphthalmia, aniridia, keratoconus, transparent degeneration, scleral lenses can not be dispensed with. They are also essential in case of surgical complications and chemical burns to the eyes. They are made from special polymers, which are characterized by good oxygen permeability. Despite the therapeutic effect, the scleral lens, due to the presence of the tunnel effect, is capable of distorting the vision of a person with normal vision. Therefore, the restrictions on their wearing include the minimum time (no more than 6 hours a day, or even less) and a ban on driving vehicles.
It is known that black lenses firmly entered the cinema of the whole world, and they were the first to be used in Hollywood. But the actors at the same time did not feel much pleasure, since working with such optics means giving extra strain on the eyes, and this is very tiring and subsequently impairs vision.
Modern black lenses are safe. By purchasing such a product, you can be sure that the color of your eyes will change dramatically, but it will look absolutely natural. With such lenses it will be convenient in any environment. And apart from the black color of the eyes of those around you, you will not be surprised.
The black lenses for the whole eye are slightly different in properties. They are created for various theatrical productions or costume parties, celebrations of Halloween or any other entertainment where a significant change in the traditional image is required. Black lenses will help the owner put the final accents when creating a certain image (for example, an alien or a vampire). And others will not disregard such a character. For a person who tries on such optics, the perception of the world will not change, since the central part of the lenses is transparent. However, a variant of the deterioration of visibility with a sharp expansion of the pupil is possible. It may be bright sunlight or an excited state. Then part of the pupil falls under the color zone and visibility is slightly limited.
Wearing and caring for such optics as black lenses is no different from ordinary ones. But ophthalmologists argue that without special cosmetics you can not do here. In addition, you should definitely pay attention to possible contraindications and the expiration date at the time of purchase.
Despite the fact that for the first time scleral lenses became available to a wide consumer in the USA, today their sale there is illegal. After all, infections brought in using black lenses easily cause blindness. We can purchase such optics only in the online store. But before buying it is worth thinking again. Maybe health is more important? After all, each person has their own physiological characteristics, and what is convenient and comfortable for one is unacceptable to another.