HAPTIC DESIGN FOR CONTINUOUS-LOOP, SCLERAL FIXATION OF POSTERIOR CHAMBER LENS

We describe a haptic design for continuous-loop fixation of posterior chamber intraocular lenses (IOLs) to the sclera. The haptic ends are b roadened to allow two perforations on each haptic through which the su tures are guided. in this manner (sutured with continuous loops), a st able four-point fixation is achieved that resists torsional forces, de pending only on the mechanical strength of the haptics. Tilt during su ture placement can be avoided by inserting the surgical needles and th e 27 gauge disposable needles through the sclera at similar angles and distances from the limbus. When tested in a simple experimental model (as well as clinically), the new IOL behaved as predicted. The advanta ge of this haptic design is a stable, tilt-free fixation by a continuo us loop that allows the knot to be buried; the disadvantage is that a sophisticated and meticulously executed surgical technique is essentia l.