Before revision: The proposal that pirates may have worn an eyepatch so that one eye would be pre-adjusted to below-deck darkness was It has been suggested that pirates before electric lighting wore eyepatches to keep one eye adjusted to darkness ahead of a boarding operation, so that they would be ready to fight below deck where the lighting was poor.
After revision: It has been suggested that pirates before electric lighting wore eyepatches to keep one eye adjusted to darkness ahead of a boarding operation, so that they would be ready to fight below deck where the lighting was poor.