Principal Lagrangian strain distribution (minimum effect [Emin]) within MR and LR including ON, versus ignoring existence of the ON. (A) Minimum principal strain, Emin color map at reference state, 26 degrees adduction. (B) Minimum principal strain, Emin within the EOMs after 6 degrees additional adduction from panel A. (C) Minimum principal strain, Emin color map at reference state, 26 degrees adduction, omitting the ON. (D) Minimum principal strain, Emin within the EOMs after 10 degrees additional adduction from panel C. Red and green dashed lines (oa and oaˊ) indicate eye orientation in the reference and adducted state, respectively.