Fig. 7
From: Corneal functional optical zone under monocular and binocular assessment
Correlation between the estimated binocular astigmatic power (magnitude) to the estimated monocular astigmatic power (magnitude) and the Intercorneal difference in terms of astigmatic power (magnitude). The absolute value of the estimated binocular astigmatism was smaller than estimated monocular astigmatism, but very similar to the intercorneal differences in astigmatism; with all three showing strong positive correlation (even/direct symmetry)