Many references concern the complications and sequelae of cataract extraction, but only occasional mention has been made of unplanned filtrations such as those deliberately sought in glaucoma surgery. In fact, in the older literature, there are several reports of large series of cataract extractions with no mention of postoperative filtration. A study made at the University of Oregon Medical School by Cowger and Swan1 in 1957 indicates that differences in operative technique explain this. They compared the postoperative complications in a group of over 500 patients operated prior to 1951 with a similar group of patients operated after 1951 with a different type of incision and wound closure. The technique generally used prior to 1951 was a keratome incision made through the conjunctiva and limbic stroma and enlarged with scissors. The flap of conjunctiva and Tenon's capsule usually was only 1 to 2-mm wide. The incision was closed by
SWAN KC, CAMPBELL L. Unintentional Filtration Following Cataract Surgery. Arch Ophthalmol. 1964;71(1):43–49. doi:10.1001/archopht.1964.00970010059007
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