iris 22 and the ciliary body 18 the iris root ciliary body and overlying sclera not shown are the eye tissue that counters the force vector from the haptic which is directed anteriorly along axis 10 a and radially outward tangential to the sphere or dome of the haptic at the anchor point see fig1 in other words the iris root ciliary body and overlying sclera apply counter posterior forces along directions 34 to anterior force 32 by butting against flanges 30 a fig2 of the haptic 30 the directions of the anterior force and of the counter posterior forces 34 are shown in fig2 the haptic design would simply buckle at the mid position of the haptic 30 due to applied force 32 at the apex of the inverted dome shaped haptic 30 if unsupported therefore the curvature of the spherical cut out or dome is designed such that the flange 30 a of haptic 30 is in continuous positional contact with the overlying tissue iris root ciliary body and overlying sclera the flange design is sized for the ciliary sulcus 24 that is the flange 30 a fits snugly into the ciliary sulcus 24 so that the flange places tension on the above mentioned overlying structures see fig1 the overlying tissue then buttresses the inverted dome shaped haptic on its anterior side preventing it from buckling in the axial direction 10 a this in effect places the haptic under a compression force only and limits shear and bending moment the sole compression force over a large cross section haptic makes the structural design very stiff and able to minimize anterior displacement of the lens during actuation from the posterior applied force 32 the ideal haptic design would be a complete dome.