Fig. 3

Motion and constraint of the limbus. a The deformation of the axis-symmetric sclera leads to a uniform displacement of the cornea in the direction of the optical axis, which does not induce deformations. b The stiff limbus does not extend circumferentially neither radially. c The only motion compatible with the stiff limbus located between more compliant tissues, cornea and sclera) is a rotation about its circumferential midline