Spectral analysis of sustained pupil light response to short and long wavelength light

The purpose of this study was to assess the characteristics of frequency domain analysis of the sustained phase of pupil light reflex (PLR) to short and long wavelength light. In the work to be presented, spectra of the sustained phase of the PLR to short- and long- wavelength light in low and high photopic conditions were tested. The findings show that the proposed analysis method is valid and reveals significant differences between the analyzed cases. The findings suggest that the technique can provide useful information about the sustained phase of PLR which is always observed during PLR response to long light stimuli. Moreover, the proposed analysis method can be considered as a new, additional approach for testing the intrinsically photo-sensitive retinal ganglion cell activity mechanism.