Fink B A, Carney L G, Hill R M
College of Optometry, Ohio State University, Columbus.
Optom Vis Sci. 1991 Apr;68(4):309-13. doi: 10.1097/00006324-199104000-00008.
The effect of changes in rigid contact lens overall and optic zone diameters on tear pump efficiency were studied using a polarographic technique. Six overall diameters ranged from 7.6 to 10.6 mm in 0.6-mm steps, with the optic zone diameter always being 1.4 mm smaller. Base curve radii were made flatter as lens overall/optic zone diameters increased in order to maintain a constant tear layer thickness. All other parameters were held constant. Oxygen uptake rates were measured for the normal, open eye, as well as after 5 min of static (without blinking) and dynamic (with blinking once every 5 s) wear of each lens design. Under both static and dynamic conditions, oxygen uptake rates increased with increase in lens overall/optic zone diameter. The differences between the static and dynamic condition data served as an index of tear pump efficiency for each lens. These differences decreased with increase in lens overall/optic zone diameter.
采用极谱技术研究了硬性接触镜总直径和光学区直径的变化对泪液泵浦效率的影响。六种总直径范围从7.6至10.6毫米，步长为0.6毫米，光学区直径始终小1.4毫米。随着镜片总直径/光学区直径增加，基弧半径变平，以保持泪液层厚度恒定。所有其他参数保持不变。测量了正常睁眼状态下以及每种镜片设计静态佩戴（不眨眼）和动态佩戴（每5秒眨眼一次）5分钟后的氧气摄取率。在静态和动态条件下，氧气摄取率均随镜片总直径/光学区直径的增加而增加。静态和动态条件数据之间的差异作为每种镜片泪液泵浦效率的指标。这些差异随镜片总直径/光学区直径的增加而减小。
