CR-39: These are the lowest costing lenses. They are great for prescriptions between +1.50 and -1.50, but they get thick for stronger prescriptions.
Polycarbonate: This is a thin, lightweight material that is also shatterproof, but can crack (like a windshield) if put under certain stresses. For that reason it is not great for drill-mounted frames. It is great for children and for safety glasses. It also has inherent UV protection. It is good for prescriptions between +0.50 and -3.00.
Trivex: Is a type of polycarbonate that is optically superior to polycarbonate. It also does not crack under stress like polycarbonate does. This is ideal for drill-mounted and rimless frames.
1.67 high index: This is thinner than CR-39, polycarbonate, and trivex. It has excellent optical quality and is great for prescriptions from -3.25 to about -5.50 and from +1.75 to about +3.00.
Scratch Protection: There are different qualities of scratch protection. This is great to prevent hairline scratches, but may still scratch if dropped or under other circumstances. We guarantee our scratch coatings from one year to two years depending on the quality. The best way to avoid scratching your lenses is to always keep your glasses in a case when you’re not wearing them.
Anti-reflection: An anti-reflective coating helps people see your eyes rather than reflections in the glasses. It also helps you see crisper through your lenses. And anti-reflection on the back side of sunglasses keeps you from seeing your eyes or face reflecting in the sunglasses. We also have an anti-reflection that selectively minimizes the harmful light rays from the computer and screens that cause the most eye fatigue. There are different qualities of anti-reflective coating and we warranty them against scratches and crazing between one to two years.
Transition: Transitions are lenses that get dark outside and lighten indoors. There are different types of Transitions depending on your needs. Some Transitions are UV activated (and therefore don’t work well behind UV-protecting windshields), and some are light activated and get darker. The groups that like Transition the most are elementary-aged children and older men.
Polarization: Polarization is put in sunglasses to selectively minimize the annoying reflected light coming off the sidewalks, water, decks, windows, etc. If you’re very light sensitive outside, polarization is the way to go! it can be a problem for certain digital displays or screens, and can make tinted side windows appear in a checkerboard pattern. There are very few people who feel nausea when looking through polarized glasses, but this is very rare and we make the sunglasses without polarization at no charge if this is the case.
UV protection: We can put UV protection in any lens, even a non-sunglasses lens!
Mirror Coating: Add a mirror coating in any color to your sunglasses to give you that trendy cool look! It also significantly reduces the amount of light going through the lens.
Single Vision: Single vision lenses are set for whatever length we specify, and just that length. They are great for most young people at all distances, or older people at either distance or near. If you’re older and your nearsighted, single vision distance glasses will make your reading blurry.
Bifocal: Line bifocals will give you distance and near. They may be narrow (25 mm), standard, or wide (up to 45mm). And executive bifocal goes all the way across the lens, but tends to be heavy. Most people do distance in the top portion of the lens and reading in the bottom. But we can specify the top and bottom portions for any distance. These are great for older people who don’t care about the line being seen by others, but who want a wide reading area.
Trifocal: A trifocal is like a bifocal but with a section for mid-range in the middle. These have to be measured high so you don’t have to tilt your head back to read. These are great for older people who have a high visual demand for all distances, need wider zones that progressives, and don’t mind the lines being seen by others.
Progressives: These are often called “no-line bifocals”. They’re actually like trifocals in that they include all distances, but there are no lines. They are narrower in the computer reading zones. About 7% of the population can’t (or won’t) adapt to progressives. Most people who need glasses for all distances love their progressive lenses after the initial adaptation period. The trick to adapting to them is to point your nose at everything you need to see in all distances. Once you adapt, progressive lenses make life a lot easier. There are progressive lenses for every need. Some progressives have wider reading zones but come at a premium price, and others have narrower zones for a lower price.