AR
= Anti Reflective and Anti Radiation coating
ONLY $4.95
Sunglass Tint = $4.95
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| Lens/Materials |
All of our standard single vison, lined bi-focal and progressive multi-focal lens are produced with premium quality, high-index (1.57), polycarbonate composite, high-impact resistant lens with full UV protection and a strong anti-scratch coating. The US standard is CR-39 plastic, which is a 1.49 index lens.
For single vision corrections, we also offer higher index lens of 1.61 and 1.67. These are used for extremely strong prescriptions to minimize the apparent thickness, weight and potential visual aberration at the outer edge of such lens. We stock these for single vision prescriptions only. Currently, all multi-focal prescriptions are created using a 1.57 index lens. The higher index lens we use cannot be tinted, nor do we provide a higher index photochromic lens at this time. We do not produce glasses with prescriptions of less than +/- 2.25 in the Sphere, in a high index lens.
A high index lens is not a "quick fix" for all circumstances, and because of its expense, is often promoted when it is unnecessary, or will not achieve the effect the customer is seeking. There ae many other considerations involved - whether a person is near-sighted or far-sighted, the strength of the correction, the width of the lens, etc.
Tint is available for any of our glasses at a cost of $4.95. Tint cannot be used with a photochromic lens option, however. Tint is permanent, while the photochromic lens darkens on exposure to direct sunlight. We have seven colors available, in three percentages of color saturation. 10% is a slight fashion tint, and simply softens the stark clarity of the lens slightly. 50% is an indoor/outdoor darkness, while 80% tint is what we generally recommend for sunglasses. To view these colors, press the blue circle, labeled "help," behind the tint data entry field on the order form.
The color of the photochromic lens we use is grey.
Anti-Reflective coating is a highly recommended upgrade, and is a $4.95 option. This is used on both sides of the lens and is particularly helpful in reducing the effect of glare, reflections and asterisms around lights for night driving. It also greatly reduces the external reflections on the lens surface which would mask the eyes, producing a much nicer cosmetic effect, both in person and in photographs.
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