To compare the histological effects of trans-scleral cyclophotocoagulation (TCP) performed with two different probes. the G-probe (IRIDEX Medical Instruments. Mountain View. CA. https://www.bekindtopets.com/hot-save-Original-German-Pre-WWI-Gewehr-91-S-Artillery-Carbine-by-V-C-Schilling-Serial-7911-b-with-Replaced-Kar-88-Stock-Dated-top-savings/