Short symptom duration ≦6months (n=4) Long symptom-duration >6months (n=14) Pvalue
Age 53.0±6.8 64.7±10.6 0.046
Preoperative BCVA
logMAR, -0.096±0.105 0.030±0.04 0.046
decimal, mean (range) 1.25 (0.9-1.5) 0.93 (0.9-1.5)  
Postoperative BCVA
logMAR, -0.176±0.000 -0.068±0.072 0.018
decimal, mean(range) 1.50 (1.5-1.5) 1.17 (0.9-1.5)  
Change in MV 0.28±0.82 0.28±0.60 0.505
Change in MH 0.90±0.52 0.15±0.63 0.025
BCVA: Best Corrected Visual Acuity; MV: Metamorphopsia score for a vertical line;
MH: metamorphopsia score for a horizontal line
The change in each score was defined as the postoperative value at 3 months subtracted from the baseline value
Values in bold indicate statistical significance
Table 4: The differences between short symptom-duration and long symptomduration after onset (Mann-Whitney U test).