The higher the refractive index, the thinner the High Index Lenses Meaning, and the higher the price. Coating and anti-ultraviolet treatment. Resin sheet can be hardened (scratch resistance), anti-reflection, anti-static, dustproof, waterproof coating processing as many as a dozen layers, different coating processing has a different role, if reduce the coating processing process, the quality of the Transition Lenses will be greatly discounted. Similarly, if the lenses do not prevent uv as uv lenses wear, so it is very harmful to the eyes. The human eye absorbs too much ultraviolet light to easily cause a variety of eye diseases such as photoinduced keratitis, cataract and macular degeneration. The same refractive index Eyeglasses Transition Lenses looks at abbe number. The same refractive Glasses Lens Index, due to the difference of lens resin material, abbe number will be different, such as the same 1.56 refractive index resin lens, abbe number has 30+ and 40+ two kinds, the former dispersion is more obvious, of course, when the purchase is the Abbe number 40+ that is better.
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