and in addition haptic portion 72 omits the use of haptic pistons as in the preceding embodiments optic portion 71 comprises anterior lens element 73 and substrate 74 formed of light transmissive materials substrate 74 includes lens piston 75 having expandable end wall 76 and fluid channels 77 in fluid communication with the interior of lens piston 75 expandable end wall 76 contacts the inner surface of anterior lens element 73 so that deflection of end wall 76 causes anterior lens element 73 to assume a more convex shape as in the preceding embodiments the thickness profile of anterior lens element 73 is tailored to produce a desired degree of accommodation when deflected as previously described channels 77 and space 78 disposed between anterior lens element 73 and substrate 74 are filled with fluid 79 having a matched index of refraction substrate 74 may define a posterior lens surface 80 or may include a separate lens element haptic portion 72 is disposed surrounding the periphery of optic portion 71 and includes transducer 81 transducer 81 comprises diaphragm 82 including elastomeric ring 83 disposed along the midline of the diaphragm that biases the ring to the radially compressed state depicted in fig8 a and 8b this state corresponds to the maximum deflection of lens piston 75 and thus the state of maximum accommodation of lens 70 ring 83 also ensures that diaphragm 82 engages and applies tension to the capsule transducer 81 adjusts the deflection of end.