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Characteristics Of Resin Lenses
Sep 11, 2017

A. Low density: Because of the gap between the molecular chain, so the number of molecules in the unit volume is small, determines the advantages of resin lenses: low proportion, light texture, is the glass lens $number;

B. Moderate refractive index: ordinary CR-39 propylene glycol carbonate, refractive index is 1.497-1.504, the current Shenyang glasses market sales of resin lenses of the highest refractive index for the Japanese Nikon Aspheric surface ultra-thin plus a hard film refractive index of 1.67 resin lenses. Japan Nikon will launch 1.74 refractive index resin lenses.

C. Surface hardness is lower than glass, easy hard to scratch, so it needs to be hardened treatment, its hard material is silica, but the hardness is not up to the hardness of the glass. So the wearer should pay attention to the maintenance of the lens;

D. Good elasticity, the relative strength is 23-28 times of the glass film because of the space between the molecular chains of organic matter and the displacement. It is decided that the resin film is another big characteristic--good impact resistance. European, American and Japanese countries prohibit children under the age of 16 from wearing glass lenses;

E. Accessibility: Can be added to prevent harmful rays, discoloration and other functions.

F. Processing: Excellent, can move the whole frame, half frame, frame-free multi-type processing. And can be permeable staining, the lens dyed into a personal favorite color.

G. Chemical property: Because it is an organic compound, it is absolutely forbidden to wear in acid and alkali environment.

H. Thermal performance: No more than 60 degrees above the environment, otherwise the surface antireflection film will rupture, and even lead to the loss of reflective film shedding phenomenon.

I. Price: In terms of quality, function, brand, grade.

J. Size design of lenses: the United States Drug and Food Administration "F. D. A" Standard, the minimum thickness of the center can be designed to 0.6 mm, but the intensity requirements are reduced, for this reason, Europe, the United States, Japan and other countries manufacturers generally put myopia, The central thickness of the lens above 100 degrees farsightedness is designed above 1.0 mm to ensure the overall strength of the lens.