Abstract：In order to investigate the accuracy and consistency of measurement values and issued measurement results for ophthalmometers by various laboratories, China National Institute of Metrology, as the pilot laboratory, organized and implemented the national Class A measurement comparison for radius verification ability of ophthalmometer from 2020 to 2021. A total of 33 laboratories participated in this measurement comparison, covering 15 provinces/municipalities directly under the Central Government, and the participating laboratories were highly representative. The comparison results were evaluated by the normalized error En value. With data processing and statistical analysis, the absolute value of En of 33 participated laboratories was between 0 and 0.85, all less than 1. The difference between the measurement results and reference values of each participated laboratory was within reasonable expectations. The results showed that the verification ability of radius of curvature in all participated laboratories met the technical requirements of measurement standards, and effectively ensured the accuracy, consistency and reliability of quantity values of ophthalmometers.
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2023, Vol. 44 
