• A further subdivision of functions during vitrectomy surgery has been enabled. By means of a separate, suturesecured fiberoptic endoilluminator and a modified infusion cannula located in the inferior quadrants, two superior sclerotomies are kept free for the use of a variety of simple and complex instruments, alone or in combination. Included among these are vitreous scissors, forceps, picks, spatulas, diathermy probes, and endophotocoagulators.
Gaynon MW, Schepens CL, Hirose T. Four-Port Bimanual Vitrectomy. Arch Ophthalmol. 1986;104(7):1088-1089. doi:10.1001/archopht.1986.01050190146056