The present invention relates to isoquinolinone derivatives, a method for preparing the same, and a pharmaceutical composition for preventing or treating poly(ADP-ribose) polymerase-1 (PARP-1)-related diseases containing the same as an active ingredient. The isoquinolinone derivatives exhibit an excellent PARP-1 inhibitory effect at a concentration of nanomolar units, and further exhibit an excellent cytoprotective effect (apoptosis inhibitory effect) on ophthalmic diseases or disorders, specifically retinal disorders, and thus can be effectively used as a pharmaceutical composition for preventing or treating PARP-1-related diseases, for example, ophthalmic diseases or disorders, which contains the same as an active ingredient.