Modern technological advancements have brought such a great variety of glasses lenses that you might get lost or confused in an optician's store. Different lenses are available to treat almost every common eye condition and to suit different lifestyles. Here are some tips and information to help you choose what kind of lens is most appropriate for your glasses.

Glass lenses are no longer used for safety reasons. Three materials are usually available for glasses lenses:
1) Regular plastic which works well for low-strength prescriptions is very enduring and lightweight. They are also the cheapest option. Choose a heavy plastic frame for your glasses to hide the thickness of the plastic lens. If you choose a metal frame, the thickness of your lens will be visible which might not be attractive.
2) Polycarbonate is a shatterproof material that is good for higher strength prescription and is thinner. It has become essential for safety glasses, sports goggles, rimless glasses, and glasses for children.
3) High index is the material for higher strength prescriptions. The lenses made up of high index are thinner and thus thought to be more attractive and comfortable than others.

Various types of glasses lenses are available which include:
Bifocals: they help you to focus on both distant and near objects. Generally lower part of the lens is for closer vision like reading and the upper part is for seeing in the distance.

Progressive lenses: they have multifocal distance areas blended into each lens such that you can see at variable distances with great ease and without having a sharp image switch from the upper to lower part of the lens as in bifocals.

Photochromatic lenses: these lenses are very helpful in conditions where the light is changing. As the light becomes stronger, these lenses become darker and protect your eyes from sunlight and ultraviolet rays. These lenses can serve as both prescription eyeglasses and sunglasses. They are available in glass or plastic. Photochromatic lenses made up of glass are faster at adjusting to light levels.

You can easily get confused while choosing glasses lenses for your sunglasses because a vast variety of choices and materials is available like a trident, Carbo-glass, ACR, etc. About 98% of regular and prescription sunglasses lenses are made from polycarbonate or CR-39. It is easy to mold in various shapes and is resistant to damage or scratches. Laminated lenses are also used which are a combination of glass and plastic.

All the lenses mentioned above can be modified. Available add-ons include polarization, mirrored, high contrast, UV protection, anti-reflective coating etc.

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