Fink B A, Hill R M, Carney L G
College of Optometry, Ohio State University, Columbus.
Optom Vis Sci. 1990 Aug;67(8):641-4. doi: 10.1097/00006324-199008000-00016.
To determine the effects of contact lens overall diameter on tear pump efficiency, oxygen uptake rates were measured for the open-eye condition and following steady-state periods of static (without blinking) and dynamic (with blinking once every 5 s) contact lens wear of oxygen-impermeable (polymethylmethacrylate) lenses of 5 overall diameters (8.2, 8.5, 8.8, 9.1, and 9.4 mm). The optic zone diameters were 1.4 mm smaller than the overall diameters in each case, while all other parameters remained constant. Differences in corneal oxygen demand following the static and dynamic conditions are a quantitative index of the tear pump efficiency for each lens size on the same cornea, and the differences were found to increase with reduction in lens overall diameter. This indicated that a more efficient tear pump was associated with small diameter designs. In addition, subjects with large palpebral aperture size, relative to lens overall diameter, were found to demonstrate better tear exchange.
为了确定隐形眼镜总直径对泪液泵效率的影响，测量了睁眼状态下以及佩戴5种总直径（8.2、8.5、8.8、9.1和9.4毫米）的不透氧（聚甲基丙烯酸甲酯）隐形眼镜在静态（不眨眼）和动态（每5秒眨眼一次）稳态佩戴后的吸氧率。每种情况下，光学区直径比总直径小1.4毫米，而所有其他参数保持不变。静态和动态条件下角膜需氧量的差异是同一角膜上每种镜片尺寸泪液泵效率的定量指标，结果发现该差异随着镜片总直径的减小而增大。这表明更高效的泪液泵与小直径设计相关。此外，相对于镜片总直径而言睑裂孔径较大的受试者泪液交换情况更好。
