Bifocal Safety Glasses

My son has this experiment in school that I think is kind of dangerous. Well, not really that dangerous maybe since if it's a school experiment, then it's tailored for kids his age. But then, I have my doubts, so I told him to use some bifocal safety glasses when he finally performs the experiment. I think it's wiser and really safer to use bifocal glasses. You can never really tell what will happen or what the outcome of an experiment is, so to avoid regrets, it's really best to be safe than sorry. So I'm looking for bifocal safety glasses online that he can use, and I found this great-looking site that sells them. I'm still looking for now, but hopefully I'll be able to find one soon. He says he would like a pair in cute colors. Oh well, kids will be kids.