Comparison of oxygen tension measurement methodologies: further studies.

The oxygen quantifying techniques of Hill and Rasson and Fatt have been compared by Roscoe and Wilson, who have also derived an "average" equivalent oxygen percentage (EOP) calibration equation. This study provides additional data which support their conclusions. Eight subjects wore three different hydrogel contact lens types of various center thicknesses and oxygen transmissibilities. Open-eyelid oxygen polarographic data were taken for each of these lenses worn by the subjects. The "average" EOP calibration equation was used to calculate the EOP values. The relation between center thickness and the ratio of the oxygen tension values derived by the two methods agrees relatively well with that found previously.