What question did this study set out to answer?

The aim is to evaluate how oxygen flux affects corneal swelling when using contact lenses.

March 21, 2026

Corneal Swelling and Oxygen Flux through a Soft Contact Lens

Key Points

The aim is to evaluate how oxygen flux affects corneal swelling when using contact lenses.
Reviewed existing literature on oxygen needs of the cornea.
Calculated the expected corneal swelling based on oxygen flux rates.
Determined oxygen tension required to limit swelling below 4%.
Corneal swelling correlates inversely with oxygen flux.
A flux of less than 1.5 μl/cm²/hr leads to increased swelling.
Maintaining an oxygen tension of about 11 mm Hg limits swelling to below 4%.

Abstract

Abstract After reviewing the oxygen needs of the cornea, we calculate the increase in corneal swelling which is predicted to occur for oxygen flux through a contact lens at the rate of less than 1.5 μl/cm 2 /hr. The amount of corneal swelling is inversely related to the oxygen flux into the anterior corneal surface. To keep corneal swelling below 4% requires an oxygen tension of about 11 mm Hg which is equivalent to a flux of 2 μl/cm 2 /hr.

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