Based on its first mention in the text, I had BUELY down as another body part (to go with GORNY), which makes this sentence sound significantly more horrifying than the tone of the game has previously suggested.
Unless (complete speculation) this sentence (ALL SITITIN and LAMB around you, MEFALO your VOLT with ISKOLEB of ZAOLB BUELY) is something like “Light flares and flashes around you, filling your vision with images of your own eyeballs”.