Human cornea: Oxygen uptake immediately following graded deprivation

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Abstract

Amicropolarographic system was used to measure the flux ofoxygen crossing the tear epithelial interface of thehuman cornea just following stabilized exposure to eight oxygen atmospheres ranging from 0% to 20.9%. In all, 336 measurements were made on the corneas of seven young healthy subjects. The rate coefficients of their immediate postexposure oxygen uptakes were found to increase nearly linearly over the atmospheric range of 20.9% (air) down to about 1.5%. Below that level, however, a marked increase in the immediaterecovery rate coefficient occurred, suggesting that at least two oxygen demand phases can be distinguished for the aerobically dependent pathways of the cornea.