1.74 high index lenses, thinner, lighter，much more flattering ，more expensive。

Who should choose 1.74 high index lenses 

1.more than -800°（-8.00D）

2.Want lens thinner, more beautiful

3. Visual is flatter

4.1.74 high index lenses can not be tinted. single-vision prescriptions only

Our suggestion for degree and lens matching options

1.50：less than -100° (-100d)
1.56：100°（-1.00D）—300°（-3.00D）
1.60： 300°（-3.00D）—600°（-6.00D）
1.67： 600°（-6.00D）—800°（-8.00D）
1.74： 800°（-8.00D）and more

The same refractive index of different degrees of lens thickness changes


The higher the refractive index of the lens, the same degree of lens thinner, the refractive index of the lens 1.5 1.56 1.6 1.67 and 1.74. 1.60 above even ultra-thin lenses, but if your degree is relatively low, in fact 1.56 and 1.6 lenses The difference in thickness is small

The highest index single-vision lens we offer is 1.74 high index polymer lens. It applies only to nearsighted (-) single visual prescriptions. It provides a thinner lens for SPH from -8.00 to -12.00 or lower and covers CYL /- 4.00 or lower.

The same -600d degree, different refractive index of the lens thickness contrast


1. The higher myopia, the thicker the lens

2. The higher the refractive index, the thinner the lens, 1.56,1.61,1.67,1.74 The higher the refractive index (1.74) The thinner the lens, the better the performance, the higher the price