Mansour A M
Department of Ophthalmology, University of Texas, Medical Branch, Galveston 77550.
Invest Ophthalmol Vis Sci. 1990 Jan;31(1):41-2.
Three methods of determining the actual size of objects on the living fundus were utilized to measure the horizontal disc diameter (H) in 68 volunteers. H1 was calculated from fundus photographs based on the refractive power of the eye and according to the formula of Bengtsson and Krakau. H2 was derived from Littmann's trigonometric curves based on the anterior corneal curvature and the refractive power of the eye. H3 was derived from Littmann's trigonometric curves based on the axial length and the refractive power of the eye. H1 underestimated H2 by a mean of 0.91% (S.D. 2.19%) in 68 eyes. H3 underestimated H2 by a mean of 3.6% (S.D. 4.0%). We concluded that H1 was an acceptable approximation of H2 in a clinical setting and retrospective studies.
采用三种确定活体眼底物体实际大小的方法，对68名志愿者的水平视盘直径（H）进行测量。H1是根据眼睛的屈光力，依据本特松和克拉考的公式，从眼底照片计算得出。H2是基于角膜前曲率和眼睛屈光力，由利特曼的三角函数曲线推导而来。H3是基于眼轴长度和眼睛屈光力，由利特曼的三角函数曲线推导而来。在68只眼中，H1比H2平均低估了0.91%（标准差2.19%）。H3比H2平均低估了3.6%（标准差4.0%）。我们得出结论，在临床环境和回顾性研究中，H1是H2的可接受近似值。
