Manual Blinking is a vision-control mechanic defined by the player briefly closing the player character’s eyes. When blinking, the player loses vision. By its nature, it is typically confined to games with a First-Person Perspective.
While Manual Blinking mainly restricts the player’s vision, the player may gain certain information when blinking. The act of blinking itself may also affect the behavior of the game or of NPCs (such as Weeping Angels).