The lens consists of a modified Goldmann type fundus lens with a 7.50-mm diameter 70-D plano-convex lens bonded to the anterior surface. The power density increases by 2.5x as the button decreases the iridian spot by 40% as compared to a flat lens. The +70 D button lens helps in condensing the laser energy so that the procedure can be carried out at lower power settings. The anodized light metal rim gives a firm grip on the lens. - Designed to facilitate full thickness iridectomies and protect against superficial corneal burns - Can be used for both Argon and ND-Yag laser iridectomy