lighting gels *do* block lasers to a degree, though not for very long... for example look at around 1:22 when he's pointing it directly into the camera.. if he leaves the pointer in the same place for a second you can see a lot of light making its way through. This is because the pigments lighting gels aren't made to stand up to long exposures like that.. Real, certified eyewear is meant to stand up to something like 10 seconds of direct exposure before the pigments begin to degrade. A lot of research and development goes into making proper laser goggles, there's a reason they're expensive. If you could safely just use lighting gels then that's what the goggle companies would do, and we'd easily be able to find $1-$5 commercially made goggles, but it's not that simple.