Everyone’s eyes are different, so we offer various lens options to fit the unique needs of each individual’s eyes.
Single-vision: Having the same prescription across the entire lens.
Bi-focal/Tri-focal: Having two or three different prescriptions in the lens, usually differentiated by a visible horizontal line, where the top portion is used for seeing distances, the middle for intermediate, and the bottom portion is used for near vision, such as reading.
Progressive: A bifocal or trifocal lens that does not show the line(s) between distance, intermediate and near prescriptions.
Transitions: With Transitions lenses, the lenses become darker or lighter when adjusting to natural light. Transitions lenses are clear when indoors and at night, but automatically adjust their level of tint to changing light conditions outdoors. http://en-us.transitions.com/aboutlenses/prodemo.htm
Anti-reflective (Crizal): These virtually invisible lenses are extremely durable, scratch resistant, and easy to clean. State-of-the-art, no-glare properties are combined with double-sided scratch resistance and a finish that repels water. Crizal lenses eliminate reflections that cause eyestrain and fatigue, especially from fluorescent lighting and computer screens. They resist dirt and smudges, so you do not have to clean them as often.https://www.essilorusa.com/products/crizal
Scratch-resistant (see Crizal, above)
Tint: A tinted lens has a gradient tint across the entire lens or graduated from top to bottom.