Fig. 13 By keeping the blade directed toward source of endoillumination, working in the “shadow” is avoided and visualization improved during dissection of epiretinal membrane. (Margherio RR: Epiretinal macular membranes. In Albert R, Jakobiec EA, eds. Principles and Practice of Ophthalmology, Vol. 2. Philadelphia: WB Saunders, 1993:919–925)