Abstract

Summary

This study validates a simplified method for measuring melanopsin-driven pupil responses using intensified blue light (550 µW/cm²) on undilated eyes, eliminating the need for mydriatic drops and ophthalmological expertise. The approach enables broader clinical and research assessment of non-image-forming light sensitivity, which is relevant for evaluating individual differences in circadian, mood, and alertness responses to lighting.
Abstract

Key Findings

  • Test-retest reliability of the PIPR without mydriatics was very high day-to-day (ICC = 0.85) and between winter and summer assessments (ICC = 0.83).
  • Compared to the gold-standard mydriatic protocol (160 µW/cm²), the intensified non-mydriatic method (550 µW/cm²) showed near-zero bias on Bland-Altman plots and moderate-to-strong agreement (ICC = 0.67).
  • Study conducted in 18 participants (5 males, mean age 34.6 ± 13.6 years), suggesting the method is feasible for use outside specialized ophthalmological settings.
Categories

Categories

The Science of Light: Validates a non-mydriatic protocol for measuring the post-illumination pupil response (PIPR) driven by melanopsin-containing ipRGCs, with quantified reliability metrics.
Eye Health & Vision: Develops a more accessible pupillometry method to assess intrinsically photosensitive retinal ganglion cell function without pharmacological dilation.
Authors

Author(s)

J Bruijel, WP Van der Meijden, D Bijlenga, F Dorani
Publication Date

Publication Year

2016
Citations

Number of Citations

12
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