alright a closed eye visual is patterns and stuff you see when your eyes are closed. You can have them when you're sober to. Just close your eyes and press your fingers against them ( not wicked hard though) after a few seconds you'll see swirls, diamonds, swirls, normal shampes, and sometimes different shapes. But when you're high, you can just close your eyes and see the same things, except much more vivid and much more beautiful.
The first time i got high, i got caught by my parents, but as they were talking to me i would blink, and when i would blink i would see black and white zigzags floating around so i'd keep my eyes shut for like 10 seconds everytime i'd blink, and if you leave them closed for a while when you open them you can still see the patterns ( sort of like staring at a lightbul or the sun )
sorry if i'm rambling hope this helped