The closed eye environement: pH.
Earlier observations showed that unbuffered bathing media held by a closed chamber against the eye would become progressively more acid over a few minutes. Such shifts, however, when examined for the naturally closed eye, even for prolonged periods, were found to be within 1 pH unit of the open-eye measured average.
D000328:Adult; D003263:Contact Lenses, Hydrophilic; D006801:Humans; D006863:Hydrogen-Ion Concentration; D009799:Ocular Physiological Phenomena; D013666:Tears / Q000032:analysis*