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A mathematical model predicting the effectiveness of cylindrical apertures in contact lenses as tear and oxygen exchange routes is compared with physiological observations made under dynamic conditions for human cornea. Both the model and the physiological data indicated that the effectiveness of optically acceptable apertures as oxygen routes was poor, the limiting case, “micro-apertures” (25 to 50μ spark generated openings) being indistinguishable in performance from a lens with no apertures at all. Table and graphical summaries of volumes of tears moved through apertures of diameters 0.1 to 1.0 mm, at lid pressures from 0.1 to 50 grams/lens area, are given.
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Hill et al. (1968) studied this question.
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