(a) The RT at the last follow-up (green) was compared with the baseline RT during surgery (grey). Increase in RT were observed in all representative patients. (b) No significant differences of RT in all the five retinal areas were observed between the patients and control groups. (Bar graphs represent S.D.; mos, months; retina area 1, temporal peripheral area; 2, temporal paracentral area; 3, central fovea of the macula; 4, nasal paracentral area; 5, nasal peripheral area).