Figure 7. Retinal vascular densities (D_box) of three layers pre- and post-ICL surgery. A: The microvascular density in the total annular zone (0.6–5.0 mm) 1 month postoperatively was statistically significantly lower than that preoperatively for the total retina and the superficial layer in all 32 patients. B: No statistically significant difference in macrovascular density was found preoperatively or at 1 week, 1 month, and 3 months postoperatively in any of the 32 patients who underwent implantable collamer lens (ICL) surgery (all p>0.05). *p<0.05, **p<0.01.