Didn't they c*ck up your night vision?
There was an article in an aviation magazine some years ago in which a Sea Vixen pilot describes using Lepus during the Beira blockade.
His observer had asked the pilot to maneuver the aircraft so that he could see the effect. As the observer was buried deep inside the aircraft, the only way this could be arranged was to roll inverted after the loft. The pilot then accidentally looked straight at the flare and, when he looked back at his instruments, all he could see was a mass of black and white shapes. Not an ideal situation on a dark night over the sea, and the only way home involved a carrier landing.
Luckily,his observer was quick on the uptake and was able to assist the pilot to get straight and level. By the time they got back to the carrier, his normal vision had returned and they landed safely. The pilot swore his observer to secrecy as he thought there might be something wrong with his eyesight. It was only years later, at a medical lecture, that he discovered that several pilots had had similar experiences and that it was quite normal.