On drawing black: Maybe biologists will discover a way to use carefully timed pulses of light to cause rods and cones to emit a diminished signal, or maybe all incoming light will be polarized, with an inverse polarized all-wavelength laser that cancels out the incoming light. Or maybe simcop2387's holographic mask idea (https://news.ycombinator.com/item?id=4273811) on a contact lens would work.
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On drawing black: Maybe biologists will discover a way to use carefully timed pulses of light to cause rods and cones to emit a diminished signal, or maybe all incoming light will be polarized, with an inverse polarized all-wavelength laser that cancels out the incoming light. Or maybe simcop2387's holographic mask idea (https://news.ycombinator.com/item?id=4273811) on a contact lens would work.