An Rx or prescription lens is an ovular-shaped piece of glass or plastic which is embeded in metal or plastic frames to help those having problems with that improve vision. The lens is aim to make vision clearer so that the glasses wearers can't get eye strain and prevent the eyesight going down. In order to make Rx lenses, an optometrist or ophthalmologist must test vision to determine the right strength or type of lens for the glasses wearers.
A prescription lens is made to correct vision problems, such as myopia, presbyopia, hyperopia and astigmatism by an optician. People who have vision problems need to have an eye exam to get prescription lenses to help them see better. The prescription of the lens is an order written by an optometrist.
There are plano lenses and prescription lenses. If you don't have any vision problem, you can buy a pair of plano sunglasses. But if you have some kinds of vision problems such as myopia or hyperopia, you may need the prescription lenses to help correct your vision problems at this time. Now, have you got a clear idea about prescription lenses?
Prescription lenses are the lenses used by the people who are suffering from vision problems. You can get prescription lenses after having an eyesight test first. Prescription lenses can help correct your vision problems and provide you with clear vision. And you will suffer from less eye strains. If you don't have any vision problem, you can just wear plano glasses which have plano lenses.
The prescription lenses have degrees. if you have vision problems, when you compare a pair of prescription lenses with a pair of plano lenses, you may find that plano lenses will provide you an image that the same as viewing the things with your bare eyes, while a pair of prescription lenses will provide you clear images.