my Old Church Slavonic is pretty rusty (well, nonexistent), but "mnogo" looks like modern Russian много (many), and the -imi I guess would be instrumental plura

my Old Church Slavonic is pretty rusty (well, nonexistent), but "mnogo" looks like modern Russian много (many), and the -imi I guess would be instrumental plural like -ими? but Russian for "eye" is глаз or око. I'm guessing oč -> око, and it's a compound word? or is the č an infix, something like "ogo" is eye, and mnogoočimi is such because the two -og-s (one from mnog and the other from go) fuse because "mnogoögočimi" would be awkward to pronounce?