My nearsightedness; my glasses were broken and I couldn’t see beyond the end of my nose -- While in the Navy, I was in charge of getting the barracks cleaned before inspection. When I checked the barracks floor, it really looked clean to me; but we failed inspection.
Barracks floor and new glasses -- I had declared the floor clean before I was called in to pick up my new glasses. After getting them and coming back and looking at the floor, I could see that it was dirty with stuff I couldn’t see before. My focus had been extended beyond the end of my nose to the floor. I could see why we failed inspection.