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Explanation: This is the area of the operation that the surgeon can see and/or operates upon. It can be via an physical opening showing the area to be operated upon, or a metaphorical opening - i.e. ONLY that area which the surgeon is interested/concentrated/working on. It may also be used to talk about the open area of the wound which the surgeon makes in order to be able to work on the area of interest such as in cardiac or gynaecological surgery.
"Once this decision is made, either the surgeon or the assistant retracts the conjunctiva such that an open surgical field exists. Ensure that the Tenon fascia is removed completely from the parallel incision sites. Lightly cauterize and clean the Tenon fascia from the area where the sclera twist fixator and parallel incisions will be placed. Do not cauterize in the region between the limbus and the belt loop. "