How much thinner are higher-index lenses?
Using 1.56 as the baseline, higher-index materials can often reduce lens thickness in the same prescription. The exact difference depends on prescription strength, frame size, fitting and lens design, so these figures are indicative rather than guaranteed.
MaterialTypical thinness vs 1.56Best suited to
1.56 StandardBaselineLower prescriptions and everyday value
1.59 UnbreakableSimilar thicknessImpact resistance, rimless frames and durability
1.60 ThinOften 10–15% thinnerA strong balance of thinness and everyday performance
1.67 Extra ThinOften 20–25% thinnerStronger prescriptions where thickness reduction matters
1.74 Ultra ThinOften 30–35% thinnerVery high prescriptions where maximum thinness is prioritised
Thinness figures are indicative only and vary with prescription strength, frame size and final lens design. Al-Aziz Optical reviews final material suitability before production.
