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The SENSIMED Triggerfish® is a prescription device indicated to detect the peak patterns of variation in intraocular pressure over a maximum period of 24 hours to identify the window of time to measure intraocular pressure by conventional clinical methods. The SENSIMED Triggerfish® is indicated for patients 22 years of age and older.

SENSIMED Triggerfish® diurnal recording system (hereinafter "STF") is a small patient-worn electronic device intended for use in the home and clinic settings for recording diurnal patterns of IOP fluctuations. The components of the STF are as follows: a hydrophilic, single-use soft contact lens with a strain gauge sensor, antenna with a telemetry chip embedded within it, allowing for continuous wireless recording of changes in ocular dimension, an external adhesive antenna worn around the eye is used to send power to, and receive measurement data from, the embedded system, a pocket-sized, battery-operated recorder worn by the patient during the 24-hour recording session, which is connected to the external adhesive antenna by a data cable. Additional components: charger to recharge the Recorder, Bluetooth universal serial bus (USB) adapter for communication between Recorder and doctor's personal computer (PC), and software for initiation recording sessions, and retrieval & display of the recorded data. The operating principle of the STF is based on the measurement of circumferential changes of the eye ball at the corneoscleral interface by an active strain gauge embedded into the periphery of a soft silicone contact lens ("ocular telemetry sensor"). During the 24-hour recording session, the sensor wirelessly transfers the data to the recording system. At the end of the recording session, all data can be transferred to the PC for review and analysis by a healthcare professional.