Single Vision Lenses
Single vision lenses are prescribed if you need correction for one field of vision, either for distance, intermediate (computer), or items up close (near vision). Single vision has the same optical focal point or correction over the entire area of the lens.
Progressive or varifocal lenses provide a smooth transition from distance correction to near correction, eliminating segment lines and allowing clear vision at all distances, including intermediate; roughly arms’ length.
A bifocal lens provides distance and near vision in one lens. The near vision correction of the lens is contained in a segment, visible on the front of the lens. This segment provides the extra power necessary for you to read clearly.
High Index Lenses
Thinner, lighter high-index lenses are especially recommended if you have a strong prescription for nearsightedness, farsightedness or astigmatism.
Anti-reflective coating (also called AR coating or anti-glare coating) improves both your vision through your lenses and the appearance of your glasses. Both benefits are due to the AR coating’s ability to eliminate reflections of light from the front and back surface of the lenses.
Scratch resistant coating
Scratch resistant lenses provide protection from everyday accidental damage. The hard coating prolongs the life of the lens
Photochromic lenses are lenses that darken automatically when exposed to sunlight. Once the light source is removed (for example by walking indoors), the lenses will gradually return to their clear state.