What are the domestic and international EMC (electromagnetic compatibility) standards for tonometers?

Tonometers (e.g., non-contact air jet tonometers, Goldmann applanation tonometers) must comply with GB 9706.1, YY 0505 (domestic), and IEC 60601-1-2 (international) EMC standards. Non-contact tonometers detect corneal deformation by jetting air pulses and involve air pumps, solenoid valves, and photoelectric detection. Standards require that the generation of the air pulses be coordinated with the detection system, and that the pressure sensor and optical path detection signals be free from electromagnetic interference to ensure accurate and repeatable intraocular pressure measurements. These devices are precision instruments and susceptible to environmental influences.