Corneal Biophysics Laboratory, Department of Optometry and Vision Science, University of Melbourne, Cardigan and Keppel Streets, Carlton 3053, Australia
We have quantified statistically the astigmatic frequency distribution. Vectorial analysis was used, as it enables formal multivariate statistical techniques to be applied to astigmatic data, allowing the simultaneous inclusion of both modulus and axis in the analytical procedure. These methods were applied to population data for each of total, corneal, and residual astigmatism from a sample of 198 adults. Right and left eyes were analyzed separately. All the distributions were found to depart significantly from a normal distribution. All the distributions were significantly leptokurtic (p < 0.005), and the distributions of total right eye, corneal right eye, and residual left eye astigmatism were also found to be significantly skewed (p < 0.05). Significant mild correlations were found between total and corneal astigmatism (p < 0.05). These findings add to the database of knowledge of astigmatic refractive error and may be of interest to those investigating refractive-error development.
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Standard deviation of astigmatic refractive error about the mean.
Morgan analyzed male and female subjects separately.
Right and left eyes were analyzed separately in the current study.
Tables (5)
Table 1
Sample Statistics for the Spherical Refractive Error Distribution for Right and Left Eyes
Standard deviation of astigmatic refractive error about the mean.
Morgan analyzed male and female subjects separately.
Right and left eyes were analyzed separately in the current study.