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Table 1 Pupil responses to light

From: Impact of blue-depleted white light on pupil dynamics, melatonin suppression and subjective alertness following real-world light exposure

Blue-Depleted White LED
Illuminance Baseline (arb. unit) Phasic max constriction (%) Sustained constriction (%) Constriction Slope (%/s) Dilation Slope (%/s) PIPR 6 s (%)
32 lx 0.46 ± 0.072 −64 ± 5.8 −56 ± 4.2 − 8.2 ± 2.3 7.7 ± 1.0* − 11 ± 6.7*
100 lx 0.43 ± 0.095 −63 ± 8.3 −54 ± 6.8 − 8.5 ± 3.5 7.1 ± 4.1 − 10 ± 13
140 lx 0.48 ± 0.056 − 67 ± 5.8 − 60 ± 4.7 −8.5 ± 2.1 6.4 ± 3.2 −19 ± 18
Standard White LED
Illuminance Baseline (arb. unit) Phasic max constriction (%) Sustained constriction (%) Constriction Slope (%/s) Dilation Slope (%/s) PIPR 6 s (%)
32 lx 0.45 ± 0.087 −62 ± 10 − 53 ± 11 − 7.2 ± 2.5 4.9 ± 1.8 −20 ± 3.5
100 lx 0.45 ± 0.097 − 65 ± 4.3 −57 ± 3.3 −9.2 ± 2.1 7.8 ± 2.8 −10 ± 11
140 lx 0.45 ± 0.094 −66 ± 4.5 −57 ± 6.5 −7.8 ± 2.3 5.1 ± 2.7 −23 ± 16
  1. Comparison of pupil responses to two different lamps – a blue-depleted white LED (top) and a standard white LED (bottom) – to three different illuminances of light. Light-induced changes in pupil size were normalized to percent of baseline pupil size. *p < 0.05 using a paired Student t-test. Data are presented as mean ± SD