Guide Easy For Health

Nowadays, it is estimated that more than 100 million people around the world wear contact lenses. These items are very popular and technology improves them daily making them even more desirable.

Why do people wear contact lenses?

There are people who wear contact lenses, instead of glasses, for esthetical reasons. They like themselves better with contact lenses than with glasses. Another reason that determines people to wear contact lenses is the cosmetic one. There is a great variety of decorative contact lenses that can change the eye’s appearance. And there are those who appreciate their practical side. They cannot play certain sports with glasses; they use devices that are incompatible with glasses etc. There is that category of people who are forced to wear contact lenses for therapeutic reasons. In their case, the contact lens is not an option. The contact lens can be a bandage in the healing process of different diseases or injuries of the cornea and it is a luxury that heals. There is also a combination between the two reasons – colour lenses with correction power which actually please a lot of persons.

The first contact lenses ever made were developed out of glass. After that, new types appeared, as the ones made of Plexiglas and the rigid gas permeable ones, but, nowadays, the soft contact lens is the most appreciated. Modern materials include silicon hydrogel or other plastic polymers like etalficon A, galyficon A, senofilcon A (used in the fabrication of Acuvue contact lenses). Rigid gas permeable contact lenses are recommended to the persons with dry eyes as these lenses contain no water that could evaporate during the wearing.

If you decide to wear contact lenses, you first have to go to an ophthalmologist, no matter what your reason may be. The doctor will be the one to decide which type of contact lenses fit your eyes best. Different factors will be considered for the prescription of a certain contact lens: the material (the silicon hydrogel is one of the newest discoveries in the field), the wearing time (daily wear, extended wear or continuous wear), the shape (spherical, toric or multifocal) and many more. Depending of the material, the contact lens can be either rigid or soft. The rigid one can be gas-tight or gas-permeable, but the soft one is always gas-permeable. There can also be a further classification made on the moisture content, on the amount of water in the contact lens. Read more…