Summary: on the eye, lifts and flattens the cornea and helps keep the eye from moving. You may feel pressure from the eyelid holder and suction ring, similar to a finger pressed firmly on your eyelid. From the time the suction ring is put on the eye until it is removed, vision appears dim or goes black. The microkeratome, an automated microsurgical instrument, is attached to the suction
Image Dimensions: 227 x 217
Image originally found here.