Table 1.
Demographic and clinical characteristics of subjects (n = 657).
Fig 1.
Distribution of corneal spherical aberration (SA; C40).
The mean corneal SA was 0.188 ± 0.095 μm, and is represented by the thick solid line. The median value was 0.195 μm, and is represented by the dotted line.
Fig 2.
Relationships between corneal spherical aberration (C40) and ocular parameters, and age.
(a) Scatterplots demonstrating corneal curvature radius and C40. A significant correlation was observed between the two (Spearman’s correlation coefficient, r = -0.177, p < 0.001). (b) Scatterplots demonstrating corneal astigmatism and C40. A significant correlation was observed between the two (r = -0.142, p < 0.001). (c) Scatterplots demonstrating axial length and C40. A significant correlation was observed between the two (r = -0.168, p < 0.001) (d) Scatterplots demonstrating age and C40. A significant correlation was observed between the two (r = -0.085, p < 0.05).
Fig 3.
Comparison of corneal spherical aberrations (SA) at the 6-mm optical zone between this study and previous reports in individuals over the mean age of 40 years [2–5,10–15].
The mean value of corneal SA in Tanzanian individuals was 0.19 μm, which tended to be small among the previously reported values.