ABSTRACT The oxygen tension under a tight contact lens is shown to rise to the minimum value for maintaining a transparent cornea at a normal blink period of five seconds only when the environment is pure oxygen. This observation also leads to the conclusion that the mixing efficiency of the process that replenishes the tears under the lens at each blink is between 5 and 20 per cent and is probably about 10 per cent.
Irving Fatt (1971) studied this question.
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