On the macbooks, f1 changes the brightness of the screen, all the way down to 0. There's also a feature called screen curtain (I don't remember which keystroke it is) that will black out the screen, and that will work on any mac with voiceover, so you could look up the keystroke for that (f8 or vo-f8 or something like that) and it will darken your screen entirely.
Hope this helps.
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