|Seiko 1.67 PolarThin lenses use a spherical base curve semi-finished blank design.|
The new 1.67 PolarThin lenses offer some unique benefits.
Humans have been protecting themselves from the bright sunlight for centuries. However, simply reducing light entering the eye using tinted lenses or by other means doesn’t eliminate blinding glare-it’s still the kind that reflects off many surfaces and scatters in the sky. For that type of glare, you’ll need a polarized lens which not only reduces the sun’s bright glare, but makes the colors appear bolder and the objects more distinct. Seiko’s new 1.67 PolarThin lenses offer some unique advantages in this lens category.
The first polarized sun lenses were introduced by Edwin H. Land in 1936. Today, polarized lenses are a very popular sun lens option. They filter polarized light, which washes out visual detail, reduces color saturation, and can even make objects disappear in the field of view if the glare is intense enough. So, what can make a polarized lens even better? If it’s thinner and lighter. Seiko has done just this with its 1.67 PolarThin lenses.
Seiko 1.67 PolarThin lenses use a spherical base curve semi-finished blank design, making them suitable for all free-form progressive and single vision designs as well as conventional single vision purposes. The design features Precise Film Positioning, a proprietary patent-pending process with the polarizing film located 0.4mm from surface center to edge. By moving the film closer to the surface, it allows the lens to be surfaced thinner. Seiko claims you can easily surface PolarThin lenses as thin as a 1.3mm center thickness, compared to all other manufacturers’ 1.8mm to 2.0mm center thickness. This makes 1.67 PolarThin lenses the thinnest and lightest Rx polarized sunwear lenses available, according to the company.
The MR-10™ resin material used in the 1.67 PolarThin lenses has an index of refraction of 1.67, an Abbe value of 32, and a specific gravity of 1.36g/cm3. The tensile strength is 50% stronger than polycarbonate and three times stronger than CR-39‘ while flexural strength is two times that of polycarbonate.
Seiko asserts it exceeds all other 1.66 and 1.67 lens products on the market. It also suggests that using MR-10 makes 1.67 PolarThin lenses more stable, less sensitive to heat, and allows them to not readily contract or expand (which prevents warping and coating deterioration). The company says they are also easier to process. Even with a 1.3mm center thickness, 1.67 PolarThin lenses exceed ANSI Z80.1 impact resistance standards by over nine times. Their high-index double hardcoat primer provides increased impact resistance and reduces fringe interference too.
With 11 base curves ranging from +0.50D to +11.00D, Seiko boasts that 1.67 PolarThin has the widest base curve selection and production range available to accommodate even the most difficult Rx’s. Blank sizes are available in 65mm, 70mm, and 75mm, and power ranges from +10.00D to -15.00D with up to a 5.00D cylinder (total power to -15.00D). The lens’ hardcoat offers substantial protection against scratches so Seiko extends a two-year warranty with normal wear and tear.
Seiko’s 1.67 PolarThin gray polarized lenses have a 16% luminous transmission and the brown polarized lens has a 14% luminous transmission and they filter 100% UVA and UVB. If all that wasn’t enough, the lens’ polarization efficiency is 98%.
While sun lenses have been around for centuries, Seiko’s 1.67 PolarThin lenses offer you and your patients the thinnest and lightest option available.
Diane F. Drake is a licensed optician, writer, lecturer, and consultant to optical professionals in Jackson, GA.
WHERE TO FIND IT:
Seiko Optical Products of America, Inc.
800-235-5367 • seikoeyewear.com