Rethinking the Postmortem Pupil: Biological Insights Through the Standardization of Miosis and Mydriasis

Background/Objectives: Postmortem pupillary assessment remains qualitative and lacks standardized quantitative criteria. The Pupil-to-Iris Ratio (PIR), a described photographic morphometric measure, enables objective postmortem pupil characterization independent of image magnification. This study aimed to establish a standardized PIR framework, characterize baseline postmortem pupillary morphology, and investigate its biological determinants.