THE DOUBLE-MIRROR GONIOSCOPIC LENS FOR SURGERY OF THE ANTERIOR-CHAMBER ANGLE

Intraoperative examination of the anterior chamber angle is necessary during several glaucoma procedures, including goniosynechialysis and g oniotomy. Many of the available lenses for this purpose are difficult to use because they require oblique illumination and their size interf eres with surgical manipulations at the limbus. We have developed a do uble-mirror gonioscopic lens that uses direct illumination; provides a n upright image of angle structures; and has a small diameter, allowin g simultaneous access to the entire limbal region. We compared our len s with the Posner goniomirror (Ocular Instruments, Bellvue, Wash) and found that it provides an equal view of angle structures. The double-m irror gonioscopic lens facilitates the intraoperative visualization of the anterior chamber angle and should allow surgeons who treat glauco ma to more accurately and safely perform angle-related procedures.