一种用于非接触式测量儿童角膜直径的方法。
A method for noncontact measurement of corneal diameter in children.
作者信息
Lagrèze Wolf A, Zobor Gergely
机构信息
Department of Ophthalmology, University Freiburg, Freiburg, Germany.
出版信息
Am J Ophthalmol. 2007 Jul;144(1):141-2. doi: 10.1016/j.ajo.2007.03.021.
PURPOSE
To evaluate a new method for measuring corneal diameter in children.
DESIGN
Prospective, cross-sectional study.
METHODS
With a digital camera set at maximum focal distance, the authors photographed 92 children twice, each with a paper ruler taped to his or her forehead. Images were opened on a personal computer and the lower half of each eye was cut out and dragged to the ruler to record corneal diameter. The coefficient of variation was calculated for each eye, and nonlinear regression analysis used to correlate diameters with age.
RESULTS
Directly after birth, corneal diameter was 9.98 mm, increasing to a plateau of 11.51 mm within the first 24 months of life. The coefficient of variation was 1.3%. Each measurement took no more than a few minutes.
CONCLUSIONS
This method allows very precise, fast, noncontact measurements of corneal diameter in newborn and young children.
目的
评估一种测量儿童角膜直径的新方法。
设计
前瞻性横断面研究。
方法
使用设置为最大焦距的数码相机，作者对92名儿童进行了两次拍照，每次拍照时都在其额头贴上一把纸尺。图像在个人电脑上打开，每只眼睛的下半部分被裁剪下来并拖到尺子上以记录角膜直径。计算每只眼睛的变异系数，并使用非线性回归分析将直径与年龄相关联。
结果
出生后即刻，角膜直径为9.98毫米，在出生后的前24个月内增加到11.51毫米的平台期。变异系数为1.3%。每次测量不超过几分钟。
结论
该方法能够对新生儿和幼儿的角膜直径进行非常精确、快速的非接触式测量。
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