If you wear glasses for vision correction and it is time to get a new pair, you can choose to buy a new set of eyeglass frames and lenses or replace the lenses in the frames you currently own.
things you’ll need:
Instructions
1 Go to an eyeglass clinic or an optometrist’s office. These are the only places where you can purchase eyeglass lenses.
2 Give an eyeglass technician your prescription for eyeglass lenses. If you do not have a prescription, you will need to have your eyes examined by an optometrist.
3 Choose the lens design you want if the optometrist did not already tell you what type to get. All About Eyeglasses states that most people choose single-vision or bifocal lenses. You can choose to get progressive lenses, which are good for those who need bifocal or multi-focal lenses because the optical power within the lens progresses smoothly and there are no bifocal lines in the glasses. Individuals with double vision or astigmatism may benefit from prism lenses, which bend and reflect light, particularly white light, differently than single-vision lenses.
4 Choose the lens material. There are three things to consider, according to All About Eye Glasses, when it comes to picking the material your lens will be made from: appearance, function and safety. Thin lenses, also called “high index lenses,” are lightweight. Web MD states these are especially good for people that have strong prescriptions. For those who want prescription sunglasses and regular eyeglasses, All About Vision recommends choosing glass or plastic photochromic lenses, which are clear indoors and in low lights and automatically darken in the sun to block harmful ultraviolet (UV) rays. If you need strong glasses because you play sports or work with machinery, choose polycarbonate lenses made from impact-resistant materials to prevent eye injuries.
5 Choose a lens coating material. Lens coating options include anti-reflective coatings to reduce glare, scratch-resistant coatings to prevent damage to plastic lenses and UV coatings that are either tinted or clear to protect eyes from sun damage.
6 Once you have made you selections, pay for your lenses.
Read more: How to Buy Eyeglass Lenses | eHow.com http://www.ehow.com/how_6460063_buy-eyeglass-lenses.html#ixzz1JOqR9jDs