The original so-called ultra-thin Transition Lenses, it means that through special processing technology, the thickness of the same degree ordered by the ordinary lens is only about one fourth, and the production material can be divided into glass and resin. Its biggest characteristic is the refraction rate is high, for Transition Glasses lens, its refraction rate can reach 1.65, 1.71, 1.8, 1.9 degrees, mainly because of the addition of lead oxide and titanium oxide substances in the production process.
Because of the unique thickness characteristics and production methods of ultra-thin Eyeglasses Transition Lenses products, it is actually a very test of the processing level of manufacturers. Because of this, do not buy miscellaneous ultra-thin lenses at random in unreliable stalls and small stores, should be in the regular glasses network, glasses shop to buy brand lenses.
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