CR39 Lenses
CR39 is a lightweight advanced polymer that has a high abrasion and scratch resistance. CR39 lenses have the same visual acuity (what you see through the lens) as glass sunglass lenses and more impact resistance.
CR39 sunglass lenses are much lighter than glass and more impact resistant. CR39 lenses are ground and polished (like glass) and not injection moulded. The high glossy finish on the front surface of the lens allows a luxurious finish to the sunglass.
CR39 stand for Columbia Resin batch 39, which was the preferred material when the scientists developed a new lightweight optical lens material in the 1950’s. CR39 lenses today make up something like 80% of all prescription lenses worldwide.
Advantages: excellent optical qualities, impact resistance, highly polished quality appearance.
Mineral Glass Lenses
Mineral glass sunglass lenses are ground and polished glass lenses have perfect acuity and lack any distortion problems caused to other lenses by extreme temperatures (eg. Leaving your sunglasses on the dashboard of your car on a hot day can bend Acrylic and Polycarbonate lenses, causing distortion). Glass lenses have high UV and IR ratings, however, they are dangerous for sporting activities and in accidents. Spotters mineral lenses are chemically toughened to enhance their strength against breakage.
Advantages: no distortion and high ultra violet and infra red protection.
Polarised Lenses
Polarised sunglass lenses block out a lot of scattered and reflected light (glare). For example, if you look at water in a pool with a standard lens, it is difficult to see an object under water clearly. This is due to the fact that the surface of the water is reflecting light from all different directions. Spotters polarised lenses filter those reflected rays so you can see below the surface of the water much more clearly.
Spotters polarised Lenses are manufactured using a special material designed to block out glare and only transmit useful light to your eyes. This optically engineered polarising material is a very thin membrane sandwiched between two pieces of optically ground lens material to filter out 99 percent of all reflected light for maximum eye protection.
However, there are some limitations to the use of polarised lenses, some drivers discover that polarised lenses can cause distortions in liquid crystal displays (LCDs). Onboard clocks and other instrument displays may be temporarily unreadable.
Advantages: fantastic for all water sports, especially fishing, where the polarising filter allows vision through the surface reflective glare.
Grilamid TR90 Frames
The Spotters Cosmic sunglasses have grilamid TR90 frames that are light weight and extremely tough. TR90 frames have a high bending strength and strong resistance to chemicals and UV damage. Grilamid TR90 sunglasses frames will maintain their shape under all temperature conditions.
Spotters Warranty
Spotters Sunglasses are guaranteed against defects in workmanship and materials for 12 months from date of purchase. Your warranty is only valid with a proof of purchase (JustSunnies.com will email you a sales receipt immediately after ordering). Your warranty does not cover normal wear and tear, scratched or broken lenses, lost screws, fading or peeling of frames, or nose piece and frame deterioration. Any alterations to the sunglasses will void your warranty.
Spotters Sunglasses reserves the right to repair or replace, in part or in full, sunglasses returned for warranty or repair. Warranty claims and other repairs are at the complete discretion of Spotters.