Is there a big difference between 1.6 and 1.67 lens?
Is there a big difference between 1.6 and 1.67 lens?
A mid-index lens of refractive index 1.6, approximately 20% thinner than a standard lens. A high-index lens of refractive index 1.67 will be approx. 33% thinner, whereas a lens with a refractive index of 1.74 will be around 42% thinner.
Does 1.67 high index make a difference?
1.67 high-index lenses surpass in thinness and lightness when compared to 1.61 high-index lenses. It helps with eye distortion caused by stronger prescriptions and is ideal for individuals with an SPH correction between +/- 7.00 and +/- 9.00, and a CYL correction between +/- 3.25 and +/- 4.00.
Is a higher index better?
In less technical terms, this means that high index lenses are better at bending light rays for vision correction. As a general rule of thumb, the higher a lens's refractive ability is, the less material is needed to achieve a particular prescription strength.2020-09-08
Is 1.60 A high index?
Material Refractive Index Abbe
---------------- ---------------- ----
1.60 1.60 42
Polycarbonate 1.59 32
Trivex 1.53 45
Standard Plastic 1.50 58
Is the a big difference between 1.61 and 1.67 index lenses?
1.67 high-index lenses surpass in thinness and lightness when compared to 1.61 high-index lenses. It helps with eye distortion caused by stronger prescriptions and is ideal for individuals with an SPH correction between +/- 7.00 and +/- 9.00, and a CYL correction between +/- 3.25 and +/- 4.00.
Do I really need 1.67 high index lenses?
Once you get close to -5.00 diopters, moving the index higher to a 1.61 is a good idea, if it fits your budget. From there, if you have a prescription over -6.00 diopters, a 1.67 high index lens is a worthwhile upgrade.2013-08-30