Abstract: Disclosed is a cup-shaped bellows member removably attached to an adjustable headband. One end of the member is positioned to bear against the closed eyelid of a patient being prepared for intraocular surgery and upon whose head the headband has been placed. The opposite end of the bellows member is closed by a plate having a tubular portion communicating with the interior of the bellows portion and adapted to be connected to a means for increasing the pressure in monitored increments inside the chamber formed by the bellows and plate.