the broad field of vision. The aspheric surface lens' base curved is evener, the weight is light, seems the nature, artistic. In the diopter high situation, can reduce
oakley sunglasses discount eyeglasses' distortion, regarding the vision number of degree high consumer, the choice aspheric surface lens is possibly more appropriate.The aspheric surface lens' superficial radian is the non-spherical surface design, this kind of design compares the spherical surface to design lens' merit is:Clearer: Have the perfect visual performance after the unique coating processing aspheric surface lens, presents is clearer, comfortable visual effect.More relaxed: After putting on the aspheric surface lens, cannot feel its existence nearly.Nature: The aspheric surface design, the nature, the vision distorts few, regards the thing to be more lifelike.Third, spherical glass and aspheric surface lens' simple distinction method
Naked eye method of inspection.The identical material, the identical number of degree's spherical surface and the aspheric surface compare, the aspheric surface lens are evener, are thinner, regard the thing to be more lifelike, the nature to be more comfortable.
discount oakley sunglasses If is treating the tube onlooking lens coating shape, generally is the tube which the spherical glass reflects is straight high diopter lens exception ; But aspheric surface lens, because the superficial various spots curvature is different, the tube shape bending is big. Lighter, is thinner, more comfortable spectacle lenses, since the eyeglasses have come out are the goal which the eyeglasses worker and the customer pursues diligently.
The be ultra-thin lens refer to the lens which manufactures with the high refractive index material, under the similar number of degree, the refractive index is higher its lens to be also thinner. May through reduce lens' curvature with the high refractive index's material to obtain the number of degree to be the same, but edge thinner concave mirror or
oakley monster dogs central thinner convex lens Piece.The glass materials are through join including the lead heavy metal oxide compound, increases the material the density to raise the refractive index, the refractive index and the proportion present are related. The refractive index increases lens' weight also obviously to increase. But under the same level number of degree, the glass lens' refractive index compares the resin lens The refractive index is high.
The resin material is raises the refractive index through the change material molecular structure, along with refractive index increase, lens' weight not necessarily increases, some also will even reduce.Some use many lens including the following type:Glass lensThe glass lens have the characteristic which bears compared to other material quality's lens blows, but the relative its weight also sinks, its refractive index is relatively high: The ordinary
oakley flak jacket piece is 1.523, the ultra thin slice is: above 1.72, highest may reach 2.0.High polymer resin lensThe high polymer resin lens are lighter than the glass lens, bear the impact not to be fragile, but because its degree of hardness is low, therefore is easier than the glass to have the scratch.PC lensAlso one material scaled height of burst member resin bears the impact,