How to choose the lenses thickness? What is the relationship between lenses thickness and the refractive index? Stefan November 27, 2019 14:58 Updated Follow The higher the refractive index, the thinner the lens, the more the light transmittance. Related articles Frame Size and Strong Rx What is the difference between single-vision and progressive lenses? What're the difference between Tint lens, Photochromic lens and Polarized lens? Difference between Spherical Lens and Aspherical Lens How to choose frames? Comments 0 comments Please sign in to leave a comment.