A method for noncontact measurement of corneal diameter in children
- PMID: 17601441
- DOI: 10.1016/j.ajo.2007.03.021
A method for noncontact measurement of corneal diameter in children
Abstract
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.
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