High transmittance, transmittance can reach 92%, if the surface of the lens is coated with one or more layers of magnesium fluoride antireflective film, the transmittance of the lens can reach 99.2%. Absorb ultraviolet rays Round Tortoise Shell Glasses, avoid ultraviolet damage to the eyes. Chemical stability Acid, alkali and other chemical corrosion resistance. Constant and accurate refractive index, refractive index 1.523, constant and accurate, accurate diopter after processing. The optical resin is characterized by light weight, hardness close to Light Tortoise Shell Glasses, refractive index of 1.490. The new high index thermal hardening resin has an index of 1.600 and is coated with a superhard and non-reflective multilayer film for enhanced wear resistance, light transmittance up to 98% and uv protection. The lens made of optical resin is not easy to break and damage the eyeball, and has been widely used. The material of crystal pledges hard wear-resisting adiabatic sex is good, but the absorption performance of ultraviolet ray is worse than optical Tortoise Shell Glasses, transmittance rate is also poor, not be the ideal material that makes Real Tortoise Shell Glasses, not be the good taste that raise an eye more.
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