Perhaps many will be surprised to learn that contact lenses were invented by none other than Leonardo da Vinci, back in 1508, describing a lens that, when placed on a human eyeball, was supposed to correct vision by changing the optical properties eyes.
Until the 40s of the last century, almost all lenses were made of rather thick glass, and their diameter was 20-30 mm (they covered the entire surface of the eyeball). Such lenses could not be worn for more than a few hours, as this caused swelling of the cornea and blurred vision, and after the lens was removed from the eye, it took more than one day to restore the cornea. Naturally, no one knew such a thing as a colored lens at that time.
In 1947, the first modern-style contact lens appeared, made of special plastic, on the creation of which scientists have been working for many years.
And only in the middle of the 20th century, a polymer hydrogel was developed, and to this day it is the basis of most modern materials from which transparent, andas well as all kinds of colored contact lenses. This flexible and soft material has unique properties: it allows oxygen to pass through and absorbs water.
Currently, there are more than 150 different materials for the manufacture of various types of contact lenses, and their quality is improving every day.
In the production of such materials, their strength, percentage of water content, oxygen permeability, biocompatibility, refractive index and other indicators are taken into account.
Today, with the help of various types of contact lenses, you can not only correct vision without glasses, but even change the color of your eyes, or you can do both at the same time.
How to choose the right lenses without compromising eye he alth?
Diopter colored lenses have been around for over 30 years. It is not only beautiful, but also very convenient. If initially they were available only to movie stars, today anyone can easily change the natural color of the eyes when he wants to. Each colored lens contains a pattern or tint color that can enhance a person's natural eye color.
However, before deciding to buy colored lenses, you should familiarize yourself with the rules for caring for them. Any colored lens requires the same care and precautions for use as regular corrective lenses.
In order for a colored lens not to cause discomfort in the eye, you need to carefully approach the choicemanufacturer and care products.
Each colored lens must be rinsed and cleaned very thoroughly. However, do not forget that the care of colored lenses requires special solutions that do not scratch or damage the paint. Information on how to care for lenses of a particular brand can always be obtained at the optician's salon where you plan to purchase lenses. Never clean colored lenses with solutions containing hydrogen peroxide - this will make them matte.
And most importantly: before you buy colored lenses, be sure to undergo an examination by an ophthalmologist. Studies show that frequent wearing of colored lenses can reduce the visual acuity and contrast sensitivity of the eyes.
