What question did this study set out to answer?

The aim is to evaluate the accuracy of the stated center thickness of various hydrogel contact lenses compared to actual measurements.

March 21, 2026

Accuracy of Manufacturers' Stated Center Thickness of Hydrogel Contact Lenses

Key Points

The aim is to evaluate the accuracy of the stated center thickness of various hydrogel contact lenses compared to actual measurements.
Measured center thickness of 184 hydrogel lenses using Radiuscope with a hydrogel lens platform.
Compared measured center thickness with the manufacturer's stated thickness for the same lens parameters.
Calculated mean differences in thickness between measured values and manufacturer specifications.
The mean difference between measured and stated center thickness exceeded 0.01 mm in all cases.
Differences varied among manufacturers' lenses, ranging from 0.012 mm to 0.030 mm.

Abstract

ABSTRACT The center thicknesses of 184 hydrogel lenses–Naturvue, Hydrocurve (thin hefilcon A), Soflens, Aquaflex, and AOsoft–were measured using the Radiuscope in combination with the hydrogel lens platform. The measured center thickness of each lens was compared with the manufacturer's stated center thickness for a lens of the same parameters. In all cases, the mean difference between the measured center thickness and stated center thickness exceeded 0.01 mm, which, based on previous study, was the expected variation in the technique. The moan difference between the measured center thickness and stated center thickness of the various manufacturers' lenses ranged from 0.012–0.030 mm.

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