A graph showing a significant correlation between the magnitudes of anterior and posterior corneal astigmatism (Pearson correlation coefficient r = 0.5746, P<0.001) in eyes with-the-rule (WTR) anterior corneal astigmatism.

<p>A graph showing a significant correlation between the magnitudes of anterior and posterior corneal astigmatism (Pearson correlation coefficient r = 0.5746, P<0.001) in eyes with-the-rule (WTR) anterior corneal astigmatism.