Hand held intraocular pressure recording system

A hand held portable tonometer device for monitoring the intraocular pressure in an eye through the sclera, comprising:

• a tubular frame having an axis and forming a handle, said handle including pressure transducer means for generating intraocular pressure measurements and having a sliding transducer mounting sleeve for mounting said transducer means on said axis, said transducer means including scleral probe means for scleral indentation,
• said transducer means including conductive means comprising an annular conductive ring mounted on said mounting sleeve;
• biasing means for positioning said transducer means along said axis and for permitting movement thereof along said axis in response to pressure applied by urging said scleral probe means against the sclera;
• contact means at a location along said axis for defining a zone of measurement within which said transducer means must be located to enable measurement of pressure, said zone having limits which correspond to predetermined upper and lower limits of measurable intraocular pressure and including signal means for providing a first audio signal when said device is operational and a second audio signal when said transducer means is in said zone, said contact means including electrical contacts positioned at a predetermined position on said axis for engagement with said ring to complete an electrical circuit to generate said second signal;
• and
• output means mounted in said frame for displaying measurements of pressure by said transducer in said zone of measurement upon receipt of said second signal.