What question did this study set out to answer?

To investigate how tear fluid impacts oxygen transmissibility in rigid gas-permeable contact lenses under different wear conditions.

March 21, 2026

In Situ Oxygen Transmissibility of Rigid Gas‐Permeable Contact Lenses

Key Points

To investigate how tear fluid impacts oxygen transmissibility in rigid gas-permeable contact lenses under different wear conditions.
Analyzed oxygen transmissibility of contact lenses in situ.
Examined effects of tear fluid thickness and lens transmissibility.
Compared open-eye and closed-eye wear scenarios.
Under closed-eye conditions, significant decrease in oxygen transmissibility was found.
Oxygen transmissibility is notably impacted when lens transmissibility exceeds 20 ⋉ 10 −9 cm ml O2/s ml mm Hg.
Average tear layer thickness greater than 20 μm led to reduced oxygen flux.

Abstract

ABSTRACT On the eye a contact lens is bathed in tear fluid, which increases its resistance to oxygen flux. For rigid gas‐permeable lenses, this effect should be small during open‐eye wear because a large amount of oxygen is provided by air‐saturated tears that are pumped under the lens. However, under closed‐eye conditions this study suggests substantial decrease in overall lens system oxygen transmissibility when lens transmissibility itself is greater than 20 ⋉ 10 −9 cm ml O 2 /s ml mm Hg and when the average thickness of the tear layer is greater than about 20 μm

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