Fig. 4
From: Corneal functional optical zone under monocular and binocular assessment
Correlation between the oblique astigmatism in OD to OS and the monocular estimated values. The monocular estimated oblique astigmatism showed strong positive correlation to OD (slope = 0.72), whilst OS showed a strong negative correlation to OD (slope = − 0.45) indicating mirror symmetry (enantiomorphism) between OS and OD for oblique astigmatism