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F. Rüfer, A. Schröder, M. Meyer, C. Erb; White–to–white corneal diameter norm evalution with the Orbscan II system . Invest. Ophthalmol. Vis. Sci. 2004;45(13):2871.
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© ARVO (1962-2015); The Authors (2016-present)
Purpose:The white–to–white corneal diameter shows abnormalities in microcornea, relative anterior microphthalmus, corneal dystrophies and other diseases. It is an important information for planning of surgical procedures like anterior chamber IOLs. As norm values are not exactly known, purpose of this study was to evaluate the white–to–white corneal diameter in healthy subjects. Methods:White–to–white was measured by the Orbscan II system in 370 right eyes and 373 left eyes of 390 healthy subjects aged from 10 – 80 years. 148 were female, 242 were male. Each measurement was repeated twice. Differences in gender, between right and left eyes and age–related alterations were analyzed statistically. Results:The average white–to–white was 11.71 ± 0.42 mm. The average white–to–white in males was 11.77 ± 0.37 mm, in females 11.64 ± 0.47 mm. The resulting normal ranges were 11.04 to 12.50 for males and 10.70 to 12.58 mm for females. Differences in gender proved to be not significant in t–test for independent samples (p=0.071). There were no statistically significant differences between right and left eyes in t–test for dependent samples (p=0.16). Corneal diameters slightly decreased with age. Conclusions:With the received norm values, a more precise diagnostic and planning of surgical procedures is possible in future. Data of the horizontal corneal diameter should contain facts about gender and age.
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