What question did this study set out to answer?

The aim is to calculate the average thickness of hydrogel lenses to improve oxygen transmissibility assessments.

March 21, 2026

Average Thickness of a Hydrogel Lens for Gas Transmissibility Calculations

Key Points

The aim is to calculate the average thickness of hydrogel lenses to improve oxygen transmissibility assessments.
Discussion of existing equations and their deficiencies
Presentation of a new equation for average thickness calculation
Analysis of thickness variation based on parameters like power, chord radius, and water content.
Findings indicate significant underestimation of thickness variation effects in higher powered lenses
Average thickness calculations change with varying parameters such as power and water content.
Results highlight that chord radius also plays a crucial role in thickness variation.

Abstract

ABSTRACT Several attempts have been made to calculate the average thickness of hydrogel lenses for the purpose of calculation of oxygen transmissibility. The deficiencies of these equations are discussed and a new equation is given. Results of average thickness calculations with variation in different parameters are presented. These results indicate that the effect of thickness variation in higher powered lenses has been seriously underestimated. The parameters which cause a major difference in the average thickness compared to the center thickness are power, chord radius, and water content.

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