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A measurement system takes measurements of intraocular pressure and displaced ocular Volume for determination of aqueous outflow resistance A device with a gid outer wall, a flexible inner wall, and an inflatable bladder in between is placed over the eye A pressure measurement system is coupled to the bladder and is configured to measure a pressure of fluid within the bladder A hydraulic unit is coupled to the bladder and configured to control a flow of fluid between the bladder and an external reservoir, and to measure a change of volume in the bladder created by the pressure applied to the eyeBoth the pressure measurement system and hydraulic unit are directly controlled by and communicated with a micro processor/computer In addition, the microprocessor com putes the outflow resistance of the eye as a function of the pressure in the bladder and the change of volume in the bladder over time.