1.74 semi-finished blue block single vision optical lens
Model:	1.74 optical lens
Place of Origin:	Jiangsu, China
Brand:	SETO
Lenses Material:	Resin
Bending	50B/200B/400B/600B/800B
Function	blue block & semi-finished
Lenses Color	Clear
Refractive Index:	1.74
Diameter:	70/75
Abbe Value:	32
Specific Gravity:	1.34
Transmittance:	>97%
Coating Choice:	UC/HC/HMC
Coating color	Green

2) What is Blue Light Block Lens? Blue cut lenses feature a special coating that reflects harmful blue light and restricts it from passing through the lenses of your eyeglasses. Blue light is emitted from computer and mobile screens and long term exposure to this type of light increases the chances of retinal damage. Hence, wearing eyeglasses having blue cut lenses while working on digital devices is a must as it may help in reducing the risk of developing eye related problems. 3) What Blue Cut Lenses Do to Protect Our Eyes? The blue cut filter coating in Pellucid Blue Lenses cut down the harmful UV rays completely along with a major portion of HEV blue light, protecting our eyes and the body from potential danger. These lenses offer sharper vision and reduce the symptoms of eyestrain that are caused by a prolonged computer exposure. Also, the contrast is improved when this special blue coating reduces screen brightness so that our eyes face minimum stress when exposed to blue light.4) Coating Choice?As 1.74 high index lens, super hydrophobic coating is the only coating choice for it. Super hydrophobic coating also name crazil coating, can make the lenses waterproof, antistatic, anti slip and oil resistance. Generally speaking , super hydrophobic coating can exist 6~12 months.1) The Feature of 1.74 index lens ①Impact resistance: 1.74 high index lenses meet FDA standard, can pass the falling spere test, have higher resistance to scratches and impact ②Design: It approaches flat base curve, can offer people amazing visual comfort and aesthetic appeal ③UV protection: 1.74 single vision lenses have UV400 protection, that means full protection against UV rays, including UVA and UVB, protect your eyes everytime and everywhere. UV400 Protection 1.74 High Index Lenses , Uncoated Eyeglass Lens Blanks For High Power ④Higher index lenses bend light at a steeper angle than lesser index versions. The ‘index’ is the result given as a number: 1.56,1.61,1.67 or 1.74 and the higher the number, the more light is bent or 'slowed down'. Therefore, these lenses have less curvature for the same focal power requiring less lens substance/material.