Corneal topography, anterior segment and high-order aberration assessments in children with ≥ 2 diopter astigmatism.

Abstract

To assess topographic findings, anterior segment parameters and high-order aberrations (HOAs) by using corneal tomography in children with 2diopters (dp) or more astigmatism. Children with 2dp or more astigmatism (study group) and children with astigmatism less than 1dp (control group) were recruited. Corneal astigmatism, mean, steep, flat keratometry (K) findings, anterior and posterior K results and anterior segment parameters including anterior chamber depth, kappa distance, horizontal corneal diameter, mean, central, middle, peripheral corneal thicknesses (CT), white-to-white (WTW) distance and pupil diameter were measured by Galilei G4 Dual Scheimpflug corneal tomography. HOAs were also assessed and compared between groups. Fifty-eight eyes of 37 children in the study group and 37 eyes of 37 children in the control group were enrolled. The mean ages of groups were 9.7 ± 2.4years and 9.3 ± 1.6years in study and control groups, respectively. The mean astigmatism was 3.3 ± 1.1dp and 0.5 ± 0.3dp in study and control groups, respectively (p < 0.05). Total corneal astigmatism was 3.3 ± 0.84dp and 1.14 ± 0.47dp in study and control groups, respectively (p < 0.05). There was a significant difference between groups in terms of posterior steep K and posterior astigmatism values. Among anterior segment parameters, mean CT and WTW values were statistically different between groups. HOAs were found to be statistically different between groups. Higher posterior corneal astigmatism, thinner mean CT and lower WTW distance were found in children with 2dp or more astigmatism. Besides, HOAs were much more in these astigmatic children.