An automated microsurgical instrument similar in desing to a carpenter's plane, used to create a thin corneal flap which remains hinged by the nose or beneath the upper eyelid. It contains a sharp blade that moves back and forth at high speed. This shaver is placed in the guide tracks of the suction ring and is advanced across the cornea using gears at a controlled speed. This process is what creates a partial flap in the cornea of uniform thickness.