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LENS MENU
The Focus Group is pleased to present this lens menu to assist you in designing eyewear for you and your family members! Please feel free to use this information to select options you would like to discuss with our optical technicians. These menu items offer general information. Our technicians can provide more detail as they get to know you and your individual needs.
LENS MATERIALS
Hard Resin (plastic) CR-39 plastic is generally the most inexpensive material choice. CR-39 lenses are about half the weight of glass. They should be treated with a scratch-resistant coating and ultra-violet filter.
High-index Made of denser plastic than CR-38, high-index lenses are thinner and lighter than regular plastic. High-index material can be used to make higher prescriptions seem much less obvious. There are several different levels of high-index.
Polycarbonate A type of high-index material that also offers the highest impact resistance of all lens materials. Polycarbonate is a good choice for children, athletic adults, and anyway at risk of falling.
Glass The original lens material is still available to those who prefer it. Glass offers the best optics and highest scratch resistance of all lens materials. The main disadvantage of glass is that it is approximately twice as heavy as hard resin plastic. Certain frames cannot accept glass lenses.
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· Single Vision Lenses Although they have only one focal point, most people below age forty use single vision lenses for all distances. For people above age forty, single vision lenses are only in focus at a specific distance.
· Bifocals Bifocals are two sets of lenses in one. The top part of a bifocal lens is focused for long distances while the bottom part is typically focused at reading distance. There are many sizes and styles of bifocals to suit individual needs.
· Trifocals Trifocals are three sets of lenses in one. The upper part is focused for long distance. The center is typically focused at arms length while the bottom is focused at reading distance. There are several sizes and styles of trifocals to suit individual needs.
· Progressive Lenses Progressive lenses do the same job as bifocals and trifocals, but without the line. They are the most popular choice for people who need bifocals or trifocals. Many different progressive lens designs are available to suit individual needs.
· Occupational Lenses Many old school plumbers and electricians have learned to wear their glasses upside down so they can look through the bifocal while working overhead. A much better solution is occupational lenses that have a segment in the top focused on overhead work.
· Specialty Bifocals We have experience in designing bifocals for many specific tasks. An example is our golf glasses, which have a tiny bifocal to the side of one lens; just enough to allow you to record your score, but without interfering with your swing.
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- Solid Tint Traditional sunglass or cosmetic tint in almost any color you can imagine. The same tint uniformly covers the entire lens.
- Gradient Tint A tint that is darker near the top of the lenses and lighter near the bottom. A double gradient has a darker color near the top with a different, but lighter color near the bottom.
- Mirror Mirror coated lenses provide a reflective surface that makes your eyes invisible to viewers while keeping them protected from glare and heat. Mirrors come in a variety of colors.
- Polarized Polarization is the best choice for reducing glare. It greatly enhances activities such as fishing, boating, skiing, flying and driving.
- Photogray Glass lenses that darken in sunlight and lighten inside, these are also available in photobrown. Car windshields inhibit the darkening effect.
- Transitions Plastic or high-index lenses that darken in sunlight and lighten inside. Car windshields inhibit the darkening effect.
- Drivewear The only photochromatic lenses that work well behind a car windshield. The tint in these sunglass lenses reacts to different weather and light conditions from overcast to bright light. In addition to the tint, Drivewear lenses are polarized and provide enhanced contrast in hazy or foggy conditions.
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