To the Editor.
—One of the chief disadvantages of transpupillary argon laser cyclophotocoagulation is the inability to properly visualize enough ciliary processes for treatment. By using an indentation funnel1,2 and tilting it so that the indentation protuberance indents the ciliary body, all ciliary processes can be visualized and treated in virtually any eye with a dilatable pupil.The same placement of the indentation funnel (with the protuberance indenting the ciliary body) causes a marked deepening of the anterior chamber. This deepening is so profound that a gonioplasty is no longer necessary in neodymium (Nd)-YAG sclerostomy.3 (If a gonioplasty is not performed in Nd-YAG sclerostomy, then Nd-YAG laser iridectomy should be performed at the end of the procedure.) The indentation funnel is so helpful in Nd-YAG sclerostomy that it is not considered required in all cases, whether gonioplasty is performed or not.
March WF. Indentation Funnel Use in Transpupillary Argon Laser Cyclophotocoagulation and Neodymium-YAG Sclerostomy. Arch Ophthalmol. 1986;104(7):972. doi:10.1001/archopht.1986.01050190030011
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