硬性透气性隐形眼镜的原位氧透过率。

In situ oxygen transmissibility of rigid gas-permeable contact lenses.

作者信息

Weissman B A, Fatt I

机构信息

Jules Stein Eye Institute, University of California School of Medicine, Los Angeles.

出版信息

Am J Optom Physiol Opt. 1988 May;65(5):400-2. doi: 10.1097/00006324-198805000-00016.

DOI:10.1097/00006324-198805000-00016

PMID:3407727

Abstract

On the eye a contact lens is bathed in tear fluid, which increases its resistance to oxygen flux. For rigid gas-permeable lenses, this effect should be small during open-eye wear because a large amount of oxygen is provided by air-saturated tears that are pumped under the lens. However, under closed-eye conditions this study suggests substantial decrease in overall lens system oxygen transmissibility when lens transmissibility itself is greater than 20 x 10(-9) cm ml O2/s ml mm Hg and when the average thickness of the tear layer is greater than about 20 micron.

摘要

在眼睛上，隐形眼镜浸泡在泪液中，这会增加其对氧气通量的阻力。对于硬性透气镜片，在睁眼佩戴时这种影响应该较小，因为大量氧气由泵入镜片下方的空气饱和泪液提供。然而，在闭眼条件下，本研究表明，当镜片透氧性本身大于20×10⁻⁹ cm·ml O₂/s·ml·mmHg且泪液层平均厚度大于约20微米时，整个镜片系统的氧气透过率会大幅下降。