I'm sure a 1W 445nm laser would would very well as a self defense weapon.
Not against someone with a gun though.
If I saw sombody running at me or someone that was about to try to hit me with a blunt object or a knife, I would pull out my laser and shine in right in his eye.
Very quick eye damage, they might not be hurt but they can't see shit.
Would you whip out your glasses with the other hand while defending against a blow so you didn't do equal damage to yourself in the melee?
Do you practice this move in your basement in your underwear by chance?