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Series of photographs during the measurement using a 25-gauge trocar–cannula with a closure valve for microincisional vitrectomy. (A) Introducing a fiber-optic sensor into the anterior chamber via limbus, (B) introducing it into the posterior vitreous cavity via pars plana, and (C) performing a two-port vitrectomy to remove the core vitreous and anterior vitreous membrane with a vitreous cutter (right cannula) under the irrigation of a balanced salt solution (left cannula).
