1. An optical inspection method, comprising: utilizing a tester to obtain an image of an inspection object; determining a target image region of the image; obtaining a plurality of central coordinates of a plurality of inspection ranges of the target image region; filling the central coordinates to an array and reordering the central coordinates according to relative relationships of the central coordinates to obtain a reordered coordinate array; and comparing the reordered coordinate array with an original coordinate array to inspect whether parts of the inspection object corresponding to the inspection ranges are missed.