This study investigated the relationship between short duration moderate-level altitude changes and changes in the internal pressure of the eye. The Mentor Tono-Pen™ was used to measure intraocular pressures of seventeen non-glaucomatous patients at ground level, in a plane at 5,000 and 10,000 feet, and again at ground level. A repeated measures analysis of variance (P < 0.05) was used to analyze the data. Altitude change was found to have no significant effect on intraocular pressures of subjects in this study.
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