The prescription glasses are those glasses which you wear based on a prescription written by an ophthalmologist or an optometrist to an optician for eyeglasses. The eyeglass prescription according to which the eyeglasses are to be made in order to correct blurred vision due to refractive errors, including myopia, hyperopia, astigmatism, and presbyopia is written on this.
The style and design of the prescription glasses have come a long way since their birth in the thirteenth century. The materials changed. The designs changed. The big brands like Gucci has come up with varieties of frames and lenses for prescription glasses.
The people suffering from near sightedness or myopia wear the prescription reading glasses while they are reading. The patients suffering from far sightedness or hyperopia wear the prescription glasses the entire day.
The third types of glasses used by people who are suffering from both the defects are the bifocal lens glasses. These upper portion is used for looking at faraway objects. Whereas the lower portion is used as a reading glass.
In today's fast life style wearing a glass for the entire day is quite a big problem. This resulted in the invention of the prescription contact lenses. The contact lens is usually placed on the cornea of the eye.
The contact lenses generally serve the same corrective purpose as conventional glasses. But they are better than the conventional glasses since they are lightweight and virtually invisible. Many commercial lenses are tinted a faint blue to make them more visible when immersed in cleaning and storage solutions. Nowadays the cosmetic lenses are becoming very popular. These lenses are deliberately colored for altering the appearance of the eye. It is becoming more and more popular now to wear the contact lenses according to the color of your dress.
It has been estimated that about 125 million people are using the contact lenses for cosmetic and prescription purposes worldwide
Another type of glasses are the goggles or safety glasses. They are the forms of protective eyewear that usually enclose or protect the eye area in order to prevent particulates from striking the eyes. They are often used in chemistry laboratories, factories and in woodworking etc. The doctors to protect the eyes of the patients prescribe the prescription goggles.