[beloch]

If you're screwing around with microwave sources, I'll pass on a warning I got from one of my profs.

Microwaves will heat your body up, but in a relatively harmless way. e.g. If you microwave your hands a bit, blood flow will transfer that heat out and things will remain pretty okay unless you really overdo it.

Your eyes are an exception. They're orbs of aqueous humor that's mostly water, but have relatively little blood flow when compared to most other tissues in the body. Microwaves will heat them up, but bloodflow won't distribute the heat away quickly. Protect your eyes around microwave sources.

[agumonkey]

What kind of protective goggles can help here ?

[beloch]

No idea. What the prof meant was to avoid exposure. i.e. Maybe don't lean in so close to get a better look at it while it's on.