Fink B A, Hill R M, Carney L G
College of Optometry, Ohio State University, Columbus.
Optom Vis Sci. 1993 Sep;70(9):733-8. doi: 10.1097/00006324-199309000-00009.
We compared the effects on rigid contact lens tear pump efficiency of changes in lens overall and optic zone diameter and of changes in lens axial edge lift by measuring corneal oxygen uptake on the right eyes of six human subjects after 5 min of both static and dynamic contact lens wear. Two sets of five lenses were worn by each subject. In set 1, overall diameter varied from 8.2 to 9.4 mm in 0.3-mm steps, with the optic zone diameter being 1.4 mm smaller and a 0.09 mm axial edge lift. In set 2, axial edge lift varied from 0.05 to 0.13 mm in 0.02-mm steps; overall diameter was 8.8 mm, and optic zone diameter was 7.4 mm. For the pooled data, a 0.3-mm decrease in overall diameter was approximately equivalent to a 0.03-mm increase in axial edge lift as a means of enhancing tear pump efficiency. However, considerable intersubject differences were exhibited, with the following increases in axial edge lift being equivalent to the 0.3-mm reduction in overall diameter: 0.01, 0.01, 0.04, 0.06, 0.09, and > 0.20 mm. This illustrates that subject factors (i.e., palpebral aperture size, lid-to-cornea geometry, corneal toricity, peripheral corneal topography, lid tension) influence lens positioning, movement, and tear pump efficiency.
我们通过测量六名人类受试者右眼在静态和动态佩戴隐形眼镜5分钟后的角膜氧摄取量，比较了隐形眼镜整体直径和光学区直径的变化以及镜片轴向边缘抬高的变化对硬性隐形眼镜泪液泵效率的影响。每位受试者佩戴两组各五片隐形眼镜。在第一组中，整体直径以0.3毫米的步长从8.2毫米变化到9.4毫米，光学区直径小1.4毫米，轴向边缘抬高为0.09毫米。在第二组中，轴向边缘抬高以0.02毫米的步长从0.05毫米变化到0.13毫米；整体直径为8.8毫米，光学区直径为7.4毫米。对于汇总数据，整体直径减少0.3毫米大致相当于轴向边缘抬高增加0.03毫米，以此作为提高泪液泵效率的一种方式。然而，受试者之间存在相当大的差异，以下轴向边缘抬高的增加量相当于整体直径减少0.3毫米：0.01、0.01、0.04、0.06、0.09和>0.20毫米。这表明个体因素（即睑裂大小、眼睑与角膜的几何形状、角膜散光、周边角膜地形图、眼睑张力）会影响镜片的定位、移动和泪液泵效率。
