Patent ID: 8800347

Claim:
A calibration apparatus for a non-contact tonometer operable to measure intraocular pressure of an eye by discharging an air pulse at the eye to applanate a cornea of the eye, the non-contact tonometer including a measurement head and a nosepiece carried by the measurement head, the nosepiece including a fluid discharge passage for discharging the air pulse along a test axis at the cornea, wherein the measurement head and nosepiece are movable as a unit relative to the cornea to align the test axis with the cornea, the calibration apparatus comprising: a body having a mating feature configured for removably mounting the body on the nosepiece or on the measurement head, wherein the mating feature of the body includes a mounting orifice sized to receive a portion of the nosepiece; a pressure sensor carried by the body and arranged in alignment with the mounting orifice to receive the air pulse when the body is mounted on the nosepiece or on the measurement head, the pressure sensor providing a pressure signal in response to the air pulse; and a radiation emitter carried by the body, wherein the radiation emitter provides a pseudo-applanation event when the pressure signal reaches a predetermined level, the pseudo-applanation event being detectable by the non-contact tonometer as though an actual corneal applanation had taken place.