1.74 blue cut optical lens
Model:	1.74 optical lens
Place of Origin:	Jiangsu, China
Brand:	SETO
Lenses Material:	Resin
Lenses Color：	Clear
Function：	Blue block
Refractive Index:	1.74
Diameter:	70/75 mm
Abbe Value:	32
Specific Gravity:	1.34
Transmittance:	>97%
Coating Choice:	SHMC
Coating color	Green
Power Range:	Sph: -3.00 ~-15.00   CYL: 0~ -4.00

1.What are the characteristics of 1.74 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. ⑤ Aspherical shape: Aspherical lenses are thinner and lighter than spherical lenses, relieving the visual fatigue caused by oppression effectively. In addition, they also can reduce aberration and distortion, give people more comfortable visual effect. ⑥Super Hydrophobic Coating: It also called crazil coating, can make the surface of the lenses super hydrophobic, smudge resistance, anti static, anti scratch, reflection and oil, etc.3. 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.2.What are the main anti-blue light technologies? ① film layer reflection technology: through the lens surface coating to reflect blue light, so as to achieve blue light blocking effect. ②substrate absorption technology: through blue light cut elements added in monomer of lens and blue light absorption so as to achieve blue light blocking effect. ③film layer reflection + substrate absorption: this is the latest anti blue light technology which combines the advantages of the above two technologies and doubles effect protection.