めいあんじゅんのう
明暗順応
Adaptation to luminosity, Adaptation to brightness and darkness
暗い場所から明るい場所に出たときに眼が明るさに慣れることを「明順応」という。逆に暗さに眼が慣れることを「暗順応」という。これらをまとめた呼び方。
The act of one’s eyes getting used to the brightness after leaving a dark place for a brighter one. It also refers to the opposite situation, in which a person gets used to the darker of two places. This is a generic (or combined) term for the two types of eye adjustments to light.