Due to different refractive index Buy Lenses For Glasses materials, of course, the smell is different. Grind the lens with a hand grinder. Experienced opticians know what refractive index Glasses Lens Index are when they smell them. Especially 1.74 and 1.67, that taste is very special. Use a specific instrument: a thickness gauge. The refractive index of the Gradient Tint Prescription Lenses can be calculated by measuring the thickness of the lens at the center point and a certain distance (2 or 3 cm) from the center point. This is the most accurate method at present. The advantages are as follows:
A. It will not be affected by the factor of different High Index Lenses Meaning center thickness from different manufacturers.
B. It will not be affected by the factor of thin lens edge due to thin processing.
C. It will not damage the lens.
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