Corneal thickness in children - 25/08/11
, Nicholas P. Bell, MD a, David K. Coats, MD a, b, Kathryn M. Brady McCreery, MD a, Douglas D. Koch, MD a, Silvia Orengo-Nania, MD a, Darrell Baskin, MD a, Kirk R. Wilhelmus, MD aRésumé |
Objective |
To determine normal central and paracentral corneal thickness measurements in the pediatric population and to determine if these measurements are consistent across different pediatric age groups and different racial groups.
Design |
Prospective observational case series.
Methods |
Pachymetry measurements were performed on 198 eyes of 108 children. The measurements were taken centrally as well as at four paracentral sites 3 mm from the corneal center at the 3, 6, 9, and 12 o'clock positions. The two-tailed t test was used for comparison of the continuous means for values of corneal thickness. Analysis of variance (ANOVA) was performed to determine differences among age and ethnic groups
Results |
The mean central corneal thickness (CCT) was 549 ± 46 μm. Paracentral corneal thickness mean values, as measured 3 mm from the corneal center, were as follows: superior, 575 ± 52 μm; nasal, 568 ± 50 μm; inferior, 568 ± 51 μm; and temporal, 574 ± 47 μm. The mean CCT values were significantly thinner than at each of the mean paracentral points (P < .05 for each comparison, paired t test). Paracentral corneal thickness measurements demonstrated no significant differences between locations (P > .05, variance analysis). The mean CCT ± SD for each age group was as follows: 6 to 23 months, 538 ± 40 μm; 2 to 4 years, 546 ± 41 μm; 5 to 9 years, 566 ± 48 μm; and 10 to 18 years, 554 ± 35 μm (ANOVA P = .012). ANOVA performed on central pachymetry values demonstrated no significant differences among racial subgroups.
Conclusions |
Pediatric central and paracentral corneal thicknesses increase slowly over time and reach adult thicknesses at 5 to 9years of age.
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| This study supported in part by an unrestricted grant from Research to Prevent Blindness, Inc., New York, New York. |
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| This manuscript is based on a portion of a thesis that was prepared in partial fulfillment of the requirements for membership in the American Ophthalmological Society. |
Vol 138 - N° 5
P. 744-748 - novembre 2004 Retour au numéro
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