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Previous findings regarding intrinsically photosensitive retinal ganglion cell (ipRGC) function after traumatic brain injury (TBI) are conflicting. We examined ipRGC-driven pupil responses in civilian TBI and control participants using two pupillography protocols that assessed transient and adaptive properties (1) a one second (s) long wavelength "red" stimulus (651 nm, 133 cd/m2) and 10 increasing intensities of 1 s short wavelength "blue" stimuli (456 nm, 0.167 to 167 cd/m2) with a 60 s interstimulus interval, and (2) two minutes of 0.1 Hz red sti