To the Editor.
—I read with interest the reports by the Silicone Study Group1,2 comparing the use of silicone oil with long-acting gases during vitrectomy for the treatment of proliferative vitreoretinopathy.The first report stated that for the patients with 36 months of follow-up, there were an increasing number of eyes with visual acuity better than or equal to 5/200 in the group receiving sulfur hexafluoride gas, and an opposite tendency for the group receiving silicone. There was also a decreasing number of eyes with macular attachment over time among the patients receiving silicone. Incomplete attachment (extramacular detachment posterior to the buckle) was also more common in eyes treated with silicone. The second report stated that for group 1 patients (eyes previously nonvitrectomized) followed up for at least 18 months, there was an advantage favoring perfluoropropane over silicone in achieving complete posterior retinal reattachment (82% over 64% at 18
Chan CK. Reports by the Silicone Study Group. Arch Ophthalmol. 1993;111(4):428. doi:10.1001/archopht.1993.01090040018006
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