Central retinal vein occlusion treated with doubling frequency laser

Objectives:To observe the efficacy of doubling frequency laser for central retinal vein occlusion. Methods:Twelve cases(13 eyes) of central retinal vein occlusion were treated with doubling frequency laser,4 eyes underwent panretinal photocoagulation, 9 eyes underwent regional retinal photocoagulation. The treatment varied from 1~3 times. Two cases received supplemental photocoagulation after reexamination. Fundus fluorescein angiography was performed in all the cases before and after the treatment and the results were compared. Results:Laser spots were regular in perfusion area, pigment epithelium atrophy was mild and no fluorescein leakage was found at the border of nonperfusion area in the 9 eyes receiving regional photocoagulation treatment. Among the 4 eyes treated with panretinal photocoagulation, 2 eyes revealed neovascular atrophy at the posterior pole area; no fluorescein leakage was found and cystoid macular edema subsided. Another 2 eyes revealed neovascular regression and a little fluorescein leakage which needed supplemental photocoagulation. No neovascular increasing, perfusion area expanding or fluorescein leakage worsening were seen. Conclusions:Laser therapy does not increase the central visual acuity but it dose help the absorption of retinal edema, hemorrhage and exudation, prevent the occurrence of proliferative vitreoretinopathy or neovascular glucoma and is protective to the present visual acuity.