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 sclera. The haptic ends are broadened to allow two perforations on each haptic through which the sutures are guided. In this manner (satured with continuous loops), a stable four-point fixation is achieved that resists torsional forces, depending only on the mechanical strength of the haptics. Tilt during suture placement can be avoided by inserting the surgical needles and the 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 advantage of this haptic design is a stable, tilt free fixation by a continuous loop that allows the knot to be buried; the disadvantage is that a sophisticated and meticulously executed surgical technique is essential.