1.56 Semi Finished Progressive photo grey Optical Lenses

Short Description:

Lens refractive index is higher, the thinner lenses, the greater the density, hardness and better, on the contrary, the lower the refractive index, the thicker the lens, the smaller the density, hardness is also poor, general glass of high hardness, so the refractive index is generally at about 1.7, and resin film hardness is poorer, the refractive index is relatively low, resin piece on market at present is the most common refractive index of 1.499 or so, Slightly better is the ultra-thin version, which has a refractive index of around 1.56 and is also used the most.

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Product Detail

Product Tags

Production Details

Place of Origin:	Jiangsu	Brand Name:	BORIS
Model Number:	photochromic Lens	Lenses Material:	SR-55
Vision Effect:	progressive lens	Coating Film:	HC/HMC/SHMC
Lenses Color:	White(indoor)	Coating Color:	Green/Blue
Index:	1.56	Specific Gravity:	1.28
Certification:	CE/ISO9001	Abbe Value:	35
Diameter:	70/75mm	Design:	Asperical

Progressive multifocal lens

Is a multiple focus lens, lens surface curvature from top to bottom before continuously increase, refractive power from the district is located in the upper part of the lens is far with, gradually, increased continuously, until almost at the bottom of the lens with area reached the number nearly with diopter, a pair of glasses can see, the distance can see close up again, you can also see object distance. Progressive lenses are described as "lenses that zoom," and a pair of glasses can be used as an extra pair of glasses. For example, is suitable for the students to read and write students use the lens (meet look at the blackboard, read books, homework and other visual demand), suitable for white-collar crowd the fatigue resistance of the lens (to adapt to the far, middle and near visual switch, easy to work), adapting to the middle-aged and old people d optimal progressive lenses (free custom curved surface, well, medium, close to switch, not dizzy brain expand).

Production Introduction

The mainstream refractive index of lens includes: 1.56, 1.60, 1.67, 1.71, 1.74 and so on. The higher the refractive index of the lens, the thinner and lighter the lens. However, the higher the refractive index of the lens is, the better it is. In general, the higher the refractive index of the lens is, the lower the Abbe number is and the more obvious the dispersion is.