Re: Dazzle gems
If we assume that Dazzle messes with the optic nerves instead of the eyeballs, then the RAW makes more sense. If a critter never had working optic nerves, then Dazzle doesn't work on them. Someone born blind at birth might have normal looking eyes but nothing connecting them to the brain so Dazzle doesn't work. Surprise! A creature born normally sighted and rendered blind through eye damage might still have functional optic nerves and be Dazzled despite being blind. Closing your eyes or being around the corner won't prevent the psychic energy from getting to your optic nerves.
OTOH, that special metal helmet or wall made of lead/crystal might block the psychic energy. Or make it worse.
You cast the spell or toss the crystal and takes your chances.
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