“…Previous studies focused on IOLs modification to prepare drug-loaded IOLs. Surface coating [ [11] , [12] , [13] , [14] , [15] , [16] , [17] ], chemical grafting [ [18] , [19] , [20] ], electrostatic interaction [ 21 ], and layer-by-layer self-assembly [ 22 , 23 ], which were all classified as surface modification techniques, have been studied. The ideas of creating extra drug-loading spaces on haptics were also reported [ 24 , 25 ].…”