Probe orientation in contact Nd:YAG laser cyclophotocoagulation.

We investigated the effect of the angle orientation of the probe during Nd:YAG transscleral cyclophotocoagulation. We found, based on histologic evaluation of the ciliary processes and surrounding structures, that the angle at which the probe was placed on the eye was critical. A probe angulation as little as 15 degrees off the perpendicular destroyed sites less than optimal for achieving the goal of decreasing aqueous humor production.