Grid laser treatment for exudative retinal detachment secondary to ischemic branch retinal vein occlusion.

Purpose: To evaluate the effectiveness of macular grid laser photocoagulation (MGLP) in obtaining the reabsorption of exudative retinal detachment (ERD) in patients with ischemic branch retinal vein occlusion (BRVO).
Methods: Prospective, randomized clinical trial including 31 patients with ERD secondary to ischemic BRVO, who were randomized either to MGLP or to observation. A complete ophthalmologic examination was performed within 7 days of treatment, and was arranged to be repeated regularly every 6 months for 24 months. MGLP was performed using a krypton laser with a spot size of 100 microm at 0.1 second. The main outcome measure was the number of eyes that had gained at least 15 letters at the 24-month examination in the two groups.
Results: By the month 24 visit, 40% of the patients in the MGLP group had gained at least three lines of visual acuity as opposed to no patient in the control group. The mean best-corrected visual acuity passed from 20/160 to 20/125 Snellen equivalent in the MGLP group, and from 20/160 to 20/400 Snellen equivalent in the control group at month 24. The difference in the mean reabsorption time was statistically significant (P < 0.001) comparing the treated group with the controls (9.1 versus 15.8 months).
Conclusion: Natural history of ERD secondary to ischemic BRVO is poor, and MGLP is able to prevent visual acuity deterioration through a 24-month follow-up.