There are several differences between them. Central retinal artery occlusion (CRAO), for example, lacks the concentric area of pigmentation around the fovea seen in chloroquine retinopathy. You may wish to compare the two conditions by checking out these videos below... CRAO: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-caXkeeVawpU.html Chloroquine Retinopathy: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-_Rtiv5hyjXQ.html