 CR-39
The standard lens used for weaker prescriptions such as plus or minus 3 and lower. (CR stands for "Columbia resin," the material used for airplane windshields during World War II; 39 refers to the recipe number. When you get into the category of, higher than plus or minus 3, your lenses become too thick in this material. it's time think about trading up to a more thinner material such as airwear
Airwear
With an high index of refraction rating at 1.59 this lens is able to bend light more efficiently than CR-39 which means it is thinner. This characteristic allows it to be suited for prescriptions up to plus or minus 6. Since airwear is made of a polycarbonate material it offers bonus characteristics such as impact -resistance (it's the same stuff used in bulletproof glass). It also offers built in 100% UV protection. If you prescription is higher than plus or minus 6, your lenses become too thick in this material, you need a higher index lens.
High-index lenses
There is a range of other high index lenses made from some of the densest material available on the market. In some cases these lenses have an index of refraction of up to 1.74. The higher the the Index of refraction the thinner the lenses and the steeper the price. Just like airwear, this group of higher index lenses have 100% UV protection inherent in the material of the lens.
Scratch Resistance
Scratch resistance is measured by the steel wool test, the lower the number the better the scratch coat.
At Eyes in Motion all our lenses already include the best scratch rating in the industry, all of which are rated 1.
Anti-Reflective
Anti-Reflective coating is becoming a standard because consumers are realizing the multiple benefits this coating offers. Anti-reflective coatings are designed to maximize the amount of light being passed through the lens, the first benefit is that this gives the user improved contrast perception. A second benefit the coating offers is elimination of annoying reflections which reduces eye strain and enhances vision system comfort. A third benefit is that it reduces glare, reflection, and halos around lights, this make a huge difference while driving at night. Finally this coating allows others to see the user's eyes which is an important for those who who value eye contact while communicating.
At Eyes in Motion all our lenses already include a premium 99% anti-reflective coating which is applied using a vacuum chamber instead of being dipped on. This method ensures an even coat that is far less likely to lift or peel compared to our competition.
Smudge Repellent
This is a more recent development, the smudge repellant is designed to address the one draw back of anti-reflective coatings...they get dirty fast and take time to clean. This coating repels water and oils and it's also two and a half times smoother. If you compare it under running water you notice the water just jumps off this coating which very useful when your caught in the rain. If you try a permanent ink demonstration you will be absolutely amazed at how easy this lens is to clean.
At Eyes in Motion all our lenses already include a smudge repellant super-hydrophic top coat by Essilor which is the world leader in lens technologies.
100% UV protection
This is an smart choice for users who choose to protect their eyes from the suns harmful UV rays. This is not a tint so it does not stop sun glare but 100% UV protection will provide just as much protection as the best sunglasses by reducing your chances of developing eye conditions associated with UV light exposure. Airwear and other high index lenses already have UV protection built into the lens so they do not require this option.
Transitions
With this option your lenses will be perfectly clear indoors, but when you step out into the sun the UV rays will activate the photo chromic feature which will automatically tint your lenses turning them into shades. Photo chromic technology has come along way from the time it seemed to take forever for the lens to darken and clear up again. Today it takes about one minute to darken and about 2 to 5 minutes to clear up. This is an incredibly convenient way to protect your eyes from the UV rays and glare but it has it's limitations: It will not get as dark as some sunglasses and since your car windshield prevents UV rays from entering the cabin, your lenses will not activate unless you're in a convertible.
|
