Since contact lenses began to be used routinely, about 50 years ago, experts realized that myopes claimed to see better after taking them off. Thus arose the orthokeratology, a method of correcting myopia that modifies the curvature of the eye through the fluid between the cornea and lens. The problem was that no one could sleep with your lenses, so it was not very helpful to keep contact lenses during the day to not need them at night.

But in the twenty-first century have appeared hyperpermeable gas materials that allow the passage of oxygen to the eye during sleep. Thus, contact lenses Ortho-K is aa place to go to bed, hence also known as the lenses pajamas, and the goal is to see or the day without using anything. They are designed to be worn for eight hours, it is estimated that every day you’re sleeping.

The improvement in corneal surveyors also allowed to be designed in a personalized manner to each eye, so do not annoy the … used mostly by children even younger than 12 years, as there are studies that suggest that may help curb the progression of myopia. But also use ….athletes and professionals who need to see well without taking anythingor any person who is unable or unwilling to laser surgery.

The adjustment takes about three months, but from the first night is fixed between and one-half diopter. “If you have three diopters, will take at least a week before take off your glasses,” said Fernando Fernández-Velázquez, myopia center that bears his name. The main feature of these lenses in front of the laser operation is that the process is reversible. In fact, the treatment must continue for life, if you stop using them, the eye returns to its previous state in less than a month. In addition, the lenses do not reduce the thickness of the cornea, which does happen with láser.Orto-K serves up to six diopters of myopia and astigmatism two. The treatment costs between 800 and 1,000 €.

Despite all these innovations, the use of contact lenses still some limitations. For example, they can not use people who have dry eye. The symptoms of this problem are feeling of sand in the eyes, itching and excessive blinking. Attributable to environmental causes (heating, air conditioning, smoke, pollution), hormonal factors (birth control pills or menopause makes it worse), age or even stress. Even the use of computers dry eye, because blink less when we stare at a screen.

Also a bad use of makeup can cause problems in our eyes. Cosmetics often contain fatty substances that enter the eye and destabilize the tear film, altering the lens. José Antonio Aranda Muñoz, National College of Opticians-Optometrists of Spain, recommends using mild products and paint the stripe on the outside of the eye (if you do it on the inside covers the ductless glands). Get contact lenses before makeup and take them off before desmaquillarte.