Do you ever have to get up at 3am to tend to a crying baby and then after you get her back to sleep realize that you have to go to the bathroom and completely blind yourself when you turn the bathroom light on which then renders you blind again when you try to navigate your way back into your dark bedroom? Anyone? No, just me? Well, if you ever do find yourself in this situation, here's a trick that really works. When leaving a dark room and entering a light room (or vice versa), keep one eye closed. The open eye will adjust to the light and then when you return to the dark room, the eye that was closed will sill be used to the dark conditions.
I didn't make this technique up. It's based on the pirate eye patch principle. Pirates who often went above and below deck, used eye patches to have one eye adjusted for the top deck and the other eye already adjusted for the darkness below deck. The strong sunlight that a pirate experienced above deck could require minutes of adjustment to the dim lighting below deck. In the critical moments of modifying the rigging, navigating, and especially during battle, every second counted. A simple switch of the patch from one eye to the other saved time and was more convenient than being temporarily blinded when going between decks.
