To the Editor.
—We read with interest the publication by the Branch Vein Occlusion Study (BVOS) Group published in the January 1986 issue of the Archives1 and feel it is an excellent study; however, several questions need clarification.The first question concerns the lack of information on the state of the vitreous. In diabetics, one study has shown that partial vitreous detachment with vitreoretinal traction is a major risk factor for progression of proliferative diabetic retinopathy, whether or not photocoagulation is performed.2 In eyes without vitreoretinal traction, there appears to be protection against progression of retinopathy.2 It would be interesting if this same principle were to hold true for other ischemic retinal diseases in which neovascularization is found, such as branch vein occlusion.The second question concerns the breakdown of patients according to amount of nonperfusion. Is there any way to separate out patients that have 5
Brooks L, Schroeder R, Anand R, Maguire J, Shakin E. More Information Needed Regarding Neovascularization and Vitreous Hemorrhage in Branch Vein Occlusion. Arch Ophthalmol. 1987;105(3):311. doi:10.1001/archopht.1987.01060030025003
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