Pupillometry

A psychophysiological measurement technique that tracks changes in pupil diameter as an objective indicator of cognitive workload, mental effort, and emotional arousal. In accessibility research, pupillometry provides a non-invasive way to assess how demanding an interface or task is for users without relying on subjective self-report. Larger pupil diameters indicate greater cognitive load, making this measure valuable for evaluating whether assistive technologies and multimodal interfaces effectively reduce the mental effort required for interaction.