time2018/07/18
Polycarbonate (PC)
myopia lens, commonly known as space myopia lens, (it is made by optical grade
PC injection molding and processing) and other materials of myopia lens
comparison,1.
The weight of Light weight PC is 1.20g/cm3, while that of cr-39 is 1.32g /cm3,
and that of mk-55-c is 1.28g/cm3.The glass has a specific weight of 2.61g/cm3.As can be seen
from the comparison, for lenses of the same size and geometric size, PC lenses
further reduce the weight of the lenses due to their minimum weight.2. The lens
Thin Thin Thin Thin lens can make the lens thinner by virtue of its excellent
impact resistance.In addition, the reason for the thinner lenses
can be found in terms of refractive index of PC materials.CR - 39 (ADC),
the refractive index of 1.499, NK - 55 - C (passbook) of refractive index is
1.550, the PC of the refractive index is 1.586, and the higher the refractive
index of the material, the thinner lenses can be made, and the refractive index
of the lower the material of the lens is thicker, so the PC myopic lens
relative to CR - 39 and fold the lenses, the edge of the concave lens thickness
is relatively thin.
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