OF THE advantages of peripheral iridectomy with scleral cautery (Scheie's Operation) is that it can be performed on any meridian of the globe.
Most surgeons prefer the 12-o'clock meridian, because, besides other advantages, it is easier to perform. The 6-o'clock meridian is chosen in cases in which there is an incipient cataract which may necessitate a cataract extraction in the near future. However, there are surgeons who prefer to perform the operation at the 6-o'clock position, irrespective of the above considerations.
The operation, however, at the 6-o'clock position by the technique originally described by H. G. Scheie presents the disadvantage that the filtering bleb is formed very near the limbus. According to Scheie's technique an inferior rectus suture is inserted and procaine (Novocain) injection follows under the conjunctiva and Tenon's capsule. Because of the risk of cutting the rectus, the incision of the conjunctiva and Tenon's capsule cannot be
Polychronakos DJ. Modification of Scheie's Fistulizing Operation for Glaucoma. Arch Ophthalmol. 1968;79(6):736–737. doi:10.1001/archopht.1968.03850040738014
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