Lens extractions through inferior limbal incisions away from the filtering cicatrix resulted in control of the intraocular pressure (IOP) in 89% of the eyes. In 67% this control was achieved without any medical therapy. Whereas if the filter was normally functioning preoperatively, the control of the IOP without medication was achieved in 80% of the eyes. The filtering fistula persisted in 40% of eyes which had a normally functioning filter preoperatively. Complications with this technique are not higher than those encountered with other techniques. Evidence is given of the poor control of the IOP and the poor outcome of the eyes that had complicated cataract extraction. A study is under progress, in which consecutive cataract extractions in the presence of patent filtering fistulas will be done alternately through the filter and from below.
Baloglou P, Matta C, Asdourian K. Cataract Extraction After Filtering OperationsPreliminary Report on the Control of Intraocular Pressure. Arch Ophthalmol. 1972;88(1):12-15. doi:10.1001/archopht.1972.01000030014004