The biggest NVG/glasses problem I had (several times) was sitting on the buggers (glasses) as I got ready. For some inexplicable reason I would put my glasses on my seat as I stood outside and put my helmet/goggles on - yes I know we should learn a lesson from our mistakes but in a 1000hr + NVG career I never did and usually never thought about my glasses until I was strapped in on top of them!