I've started flying a lot of FPV recently, and I noticed that my Fat Shark Base glasses were getting quite hot after just minutes of use. Using my lab's handheld thermal infrared camera, I took some photos of the goggles and my quad after a few minutes in the air partially to try and troubleshoot the heat problem but mostly just for fun.
The goggles appear to have melted in one spot and "heat shrunk" (see above)
IR image confirms the source of heat is in the same place:
Here are some thermal snaps of my quad:
The bright white in the front / center is a 900mhz video transmitter and HoryzonHD camera circuit board (camera itself is below decks)