White-to-white corneal diameter, pupil diameter, central corneal thickness and thinnest corneal thickness values of emmetropic subjects

Abstract

This report assesses white-to-white corneal diameter, pupil diameter, central corneal thickness and thinnest corneal thickness values in a large sample of emmetropic subjects. Three hundred and seventy-nine eyes of 379 young healthy emmetropic subjects were analyzed by means of scanning-slit corneal topography. The age of the subjects ranged from 18 to 53years (mean±SD=29±7). The mean of five consecutive measurements of the central corneal thickness, the thinnest corneal thickness, the white-to-white corneal diameter, and the photopic pupil diameter was recorded. The central corneal thickness ranged from 528 to 588μm; the thinnest corneal thickness ranged from 504 to 574μm; the white-to-white corneal diameter ranged from 11.5 to 12.3mm; and the pupil diameter ranged from 3.0 to 4.7mm. The central and the thinnest corneal thickness were positively correlated (r=0.94, p<0.001), and the pupil diameter was significantly higher in females (p<0.001). This study shows that there are no differences in white-to-white corneal diameter, central corneal thickness, and thinnest corneal thickness between emmetropic females and males. However, pupil diameters are greater in emmetropic females.