Re: Riddick's Eyeshine
I don't know this Riddick guy from Adam, but if they are, in fact, goggles, they would also protect him against being poked in the eye because, well, he's wearing goggles. A flash like a paint-ball to the face would probably be built NND, with the defense being solid eye covering (since he could easily wipe the paint off the lenses).
IMHO.
So, I'm thinking a vulnerability to light-based flashes would be uncommon (it's rare that there isn't a Flash thrown at least once a fight in just about every game I've been in), and a Phys Lim that hoses his sight perception rolls in brightly lit areas, if he's sans goggles, would be uncommon (I'm assuming he rarely, if ever, takes the darn things off). Unless he can be knocked unconscious by enough exposure to bright lights, though, I'd skip the Susceptibility.