4-Mirror, All-Glass Design 50% more image magnification than our classic G-4 Gonio enables more detailed viewing of the trabecular meshwork Available with a * large ring (28.5 mm) * a small ring (25.5 mm) * 2-position handle (right/left handed) No flange version is ideal for dynamic and indentation gonioscopy Flanged version provides stability for laser trabeculoplasty Mirror Angles : 4 x 64? Image Magnification : 1.0x Laser Spot Size : 0.67x Contact Diameter : 15 mm