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Tools used by EMS providers for pupillary diameter assessment.(A) A printed pupillary gauge chart (1.5–8.0 mm in 0.5-mm increments) used in some EMS regions to aid visual estimation. (B) A penlight-based gauge with markings from 2–9 mm in 1-mm increments.For the SOS-KANTO 2017 registry, however, the official recorded value was always rounded to the nearest 1 mm and documented within the standardized 1–8 mm scale.
