Abstract: A device for continuously monitoring the intraocular pressure in an eye, which includes a scleral contact lens having a pressure transducer thereon for measuring intraocular pressure. The lens is sized to fit within the sclera of an eye for positioning the pressure transducer in fixed contact with the sclera in the superior temporal quadrant of the eye in the superior cul-de-sac during movement of the eye. The pressure transducer includes at least one semiconductor strain gauge crystal adapted to generate an electrical resistance which is responsive to inraocular pressure. A projection is provided for scleral indentation and is positioned to transmit response to intracular pressure to the crystal. A battery powered memory unit is mounted in the lens in non-scleral contact for recording measurements of pressure by the transducer over a predetermined period of time, preferably by, measuring the resistance through the crystal. The crystal is fixed to a flexible membrane forming a mounting on the contact lens.

Abstract: A hand held portable tonometer device for monitoring the intraocular pressure in an eye through the sclera. The device has a tubular frame having an axis and forming a handle by which the device is held. The handle includes a pressure transducer for generating intraocular pressure measurements upon contact of a scleral probe on the eye to cause a scleral indentation and to transmit an input of the intraocular pressure. The transducer has a sliding transducer mounting sleeve mounting it on the axis. A spring positions the transducer along the axis at a point in response to pressure applied by urging the scleral probe against the sclera. The device includes an annular conductive ring mounted on the mounting sleeve and electrical contacts positioned at a predetermined position on the axis to complete an electrical circuit to generate a signal defining a zone of measurement which has predetermined upper and lower limits of pressure.