An intraocular pressure microsurgical system, comprising: an infusion chamber, said infusion chamber having a first chamber for holding irrigating fluid and a second chamber for holding irrigating fluid, said first chamber not fluidly coupled to said second chamber; a first fluid level sensor for measuring the level of irrigating fluid in said first chamber and a second fluid level sensor for measuring the level of irrigating fluid in said second chamber; an infusion source fluidly coupled to said first chamber to provide irrigating fluid to said first chamber and fluidly coupled to said second chamber to provide irrigating fluid to said second chamber; a pressurised gas source fluidly coupled to said first chamber and fluidly coupled to said second chamber; a valve arrangement and a valve actuator arrangement adapted to direct gas from the pressurized gas source to said first chamber and to said second chamber; a surgical device for providing irrigating fluid to an eye fluidly coupled to said first chamber and fluidly coupled to said second chamber; a flow sensor for measuring a flow rate of irrigating fluid between said first chamber and said surgical device, and between said second chamber and said surgical device; and a microprocessor configured to; receive a desired intraocular pressure input via a user input; send appropriate control signals via a valve actuator arrangement interface so as to provide an appropriate level of pressurized air to said first or second chamber (16b, 16a) so that irrigating fluid is provided to said surgical device, receive a signal from said flow sensor corresponding to a flow rate of irrigating fluid; calculate a predicted intraocular pressure using the signal from said flow sensor and empirically determined impedance information of said microsurgical system; send an appropriate feedback control signal via a valve actuator arrangement interface so as to maintain the predicted intraocular pressure at or near the desired intraocular pressure during all portions of the surgery; said microprocessor being further configured to: receive a signal from said first fluid level sensor corresponding to the level of fluid in said first chamber, and when it is determined that the level of irrigating fluid in said first chamber reaches a bottom limit send appropriate control signals via a valve actuator arrangement interface so as to end the provision of irrigating fluid to the surgical device from said first chamber; send appropriate control signals via a valve actuator arrangement interface so as to provide an appropriate level of pressurized air to the second chamber, to provide irrigating fluid to said surgical device from said second chamber; and send appropriate control signals via a valve actuator arrangement interface so as to refill said first chamber with said irrigation fluid from said infusion source. an infusion chamber, said infusion chamber having a first chamber for holding irrigating fluid and a second chamber for holding irrigating fluid, said first chamber not fluidly coupled to said second chamber; a first fluid level sensor for measuring the level of irrigating fluid in said first chamber and a second fluid level sensor for measuring the level of irrigating fluid in said second chamber; an infusion source fluidly coupled to said first chamber to provide irrigating fluid to said first chamber and fluidly coupled to said second chamber to provide irrigating fluid to said second chamber; a pressurised gas source fluidly coupled to said first chamber and fluidly coupled to said second chamber; a valve arrangement and a valve actuator arrangement adapted to direct gas from the pressurized gas source to said first chamber and to said second chamber; a surgical device for providing irrigating fluid to an eye fluidly coupled to said first chamber and fluidly coupled to said second chamber; a flow sensor for measuring a flow rate of irrigating fluid between said first chamber and said surgical device, and between said second chamber and said surgical device; and receive a desired intraocular pressure input via a user input; send appropriate control signals via a valve actuator arrangement interface so as to provide an appropriate level of pressurized air to said first or second chamber (16b, 16a) so that irrigating fluid is provided to said surgical device, receive a signal from said flow sensor corresponding to a flow rate of irrigating fluid; calculate a predicted intraocular pressure using the signal from said flow sensor and empirically determined impedance information of said microsurgical system; send an appropriate feedback control signal via a valve actuator arrangement interface so as to maintain the predicted intraocular pressure at or near the desired intraocular pressure during all portions of the surgery; receive a signal from said first fluid level sensor corresponding to the level of fluid in said first chamber, and when it is determined that the level of irrigating fluid in said first chamber reaches a bottom limit send appropriate control signals via a valve actuator arrangement interface so as to end the provision of irrigating fluid to the surgical device from said first chamber; send appropriate control signals via a valve actuator arrangement interface so as to provide an appropriate level of pressurized air to the second chamber, to provide irrigating fluid to said surgical device from said second chamber; and send appropriate control signals via a valve actuator arrangement interface so as to refill said first chamber with said irrigation fluid from said infusion source.