That already exists and you don't have to drop it in your eye.
It's called a blindfold.
Probably meant for the military to see while operating in the middle of the dark rain forest. Bringing some infrared devices will not be needed anymore but just a tiny container of it inside their pockets. If it comes from fish down below then it came from nature that flash lights won't hurt the eyes. This is very useful for the authorities really, they could improve it too to last more tan 50minutes.
I was responding to the one that makes you blind by target.
The reason that so many pirates wore eye patches during the day, was to preserve night vision in one eye. Shielding it from sunlight strengthens night vision, and this was valuable to them, as a lot of their action was nocturnal.
What the, my life has been a lie
I thought they wore them because it was a scar.