How to choose the lenses thickness? What is the relationship between lenses thickness and the refractive index? Dave November 27, 2019 14:58 Updated Follow The higher the refractive index, the thinner the lens, the more the light transmittance. Related articles How do I get thinner lenses? What do the Lens Index numbers mean? Frame Size and Strong Rx Difference between Spherical Lens and Aspherical Lens What is the material of your lens? Comments 0 comments Please sign in to leave a comment.