|Refractive index: 1.61|
|Monomer: imported from Korea|
|Specific gravity: 1.34|
|Place of origin: China|
|Power Range: 0.00~+-20.00,CYL:.0.00~+-6.00|
As they bend light more than an ordinary lens they can be made much thinner but offer the same prescription power lenses.
Photochromic lenses are available in nearly all lens materials and designs, including high indexes , bifocal and progressive. An added benefit of photochromic lenses is that they shield your eyes from 100 percent of the sun's harmful UVA and UVB rays.
Because a person's lifetime exposure to sunlight and UV radiation has been associated with cataracts later in life, it's a good idea to consider photochromic lenses for children's eyewear as well as for eyeglasses for adults.
Modern photochromic lenses tend to be plastic and instead of silver chemicals they contain organic (carbon-based) molecules called naphthopyrans that react to light in a slightly different way: they subtly change their molecular structure when ultraviolet light strikes them.
Hard Coating : it can protect the uncoated lenses from scratch resistance.
Anti-Reflection Coating : it also called hard multi coated, can protect the lens effectively from reflection, enhance functional and charity of your vision .
Super Hydrophobic Coating : it also called crizal coating, can make the lenses waterproof, antistatic, anti slip and oil resistance. Generally speaking, super hydrophobic coating can exist 6~12 months.