Clinical Study

Subthreshold Micropulse Photocoagulation for Persistent Macular Edema Secondary to Branch Retinal Vein Occlusion including Best-Corrected Visual Acuity Greater Than 20/40

Table 4

Changes in BCVA after subthreshold micropulse diode laser photocoagulation ( = 32).

Change in BCVAaā€‰1 month3 months6 months12 months

Improved (, %)Total ( = 32)3/32 (9.4%)4/32 (12.5%)3/32 (9.4%)5/32 (15.6%)
Group I ( = 15)3/15 (20.0%)4/15 (26.7%)3/15 (20.0%)5/15 (33.3%)
Group II ( = 17)0/17 (0%)0/17 (0%)0/17 (0%)0/17 (0%)

Unchanged (, %)Total ( = 32)29/32 (90.6%)26/32 (81.3%)26/32 (81.3%)25/32 (78.1%)
Group I ( = 15)12/15 (80.0%)11/15 (73.3%)10/15 (66.7%)9/15 (60.0%)
Group II ( = 17)17/17 (100.0%)15/17 (88.2%)16/17 (94.1%)16/17 (94.1%)

Worsened (, %)Total ( = 32)0/32 (0%)2/32 (6.3%)3/32 (9.4%)2/32 (6.3%)
Group I ( = 15)0/15 (0%)0/15 (0%)2/15 (13.3%)1/15 (6.7%)
Group II ( = 17)0/17 (0%)2/17 (11.8%)1/17 (5.9%)1/17 (5.9%)

BCVA: best-corrected visual acuity; Group I: eyes with BCVA 20/40; Group II: eyes with BCVA 20/40.
aChange in BCVA is defined as 0.2 or more log MAR (logarithm of the minimal angle of resolution) value. Improved: 0.2 or more log MAR gain; Unchanged: within 0.2 log MAR change; Worsened: 0.2 or more log MAR loss.