Aspheric Lenses
If you hate thick prescription eyeglasses, try lenses in a high-index material. They offer superior optics in a thinner, lighter lens. Aspherics are ideal for strong prescriptions because they are flatter and thinner. They also provide better vision than ordinary lenses and look better because they lessen farsighted eye magnification and nearsighted eye minification.

Eyeglass Lens Coatings
Anti-reflective coating, scratch resistant coating and UV lens treatments are options that enhance your vision and appearance, increase the durability of your eyeglasses and protect your eyes from the sun's harmful rays.

Photo courtsesy of allaboutvision.com
The lens at left has anti-reflective coating.

Photochromics and Tints
Photochromic lenses (also called variable-tint lenses or transition lenses) that darken in the sun are convenient for people who spend a lot of time outdoors.

Multifocal Lenses
Bifocals and trifocals come in many configurations, depending on whether you sit at the computer all day, play golf, work on automobiles, etc.

Occupational Bifocals and Trifocals
Special-purpose multifocal lenses can help people over age 40 perform certain tasks at home or at work more comfortably.

Reading Glasses
By the time you reach age 40 and your eyesight is otherwise good, it's very likely you will need special reading glasses to help you see that fine print on the menu.

Progressive Addition Lenses
Progressive lenses can do everything a bifocal or trifocal can do, but without the lines.

Polycarbonate Lenses for Eyeglasses
Polycarbonate lenses are very impact-resistant, and thinner than regular plastic lenses. They're great for active people — especially kids.

All of the above info courtesy of AllAboutVision.com.