Fig. 8
From: Corneal functional optical zone under monocular and binocular assessment
Correlation between the estimated binocular cardinal astigmatism to the estimated monocular cardinal astigmatism and the Intercorneal difference in terms of cardinal astigmatism. Binocular estimated cardinal astigmatism correlated perfectly (R2 = 1) with monocular estimated cardinal astigmatism (even/direct symmetry), however showing poor correlation with the intercorneal differences in cardinal astigmatism (R2 = 0.0062)