Mean vessel density (VD), standard deviation (SD) and difference of VD before and after application of 5% phenylephrine and 0.5% tropicamide in superficial vascular plexus (SVP), intermediate capillary plexus (ICP), and deep capillary plexus (DCP) considering all 12 sectors.

Mean vessel density (VD), standard deviation (SD) and difference of VD before and after application of 5% phenylephrine and 0.5% tropicamide in superficial vascular plexus (SVP), intermediate capillary plexus (ICP), and deep capillary plexus (DCP) considering all 12 sectors.纳入全部12个分区，统计5%去氧肾上腺素与0.5%托吡卡胺应用前后，浅层血管丛（SVP）、中间毛细血管丛（ICP）及深层毛细血管丛（DCP）的平均血管密度（VD）、标准差（SD）以及血管密度差值。