10.1371/journal.pone.0178361.g001 Yung Ju Yoo Yung Ju Yoo Hee Kyung Yang Hee Kyung Yang Jeong-Min Hwang Jeong-Min Hwang Schematic diagram of the pupillary light response illustrating the recorded pupillary light reflex parameters. Public Library of Science 2017 inter-eye difference values Pupillary light reflex baseline pupillary measurements pupil diameter T 75 Horner syndrome case control study baseline inter-eye difference constriction ratio AUC PLR Horner group USA Baseline inter-eye difference apraclonidine instillation TX Main outcome measures contralateral eye pupil diameters Horner syndrome Objectives inter-eye difference 2017-06-02 17:38:03 Figure https://plos.figshare.com/articles/figure/Schematic_diagram_of_the_pupillary_light_response_illustrating_the_recorded_pupillary_light_reflex_parameters_/5068708 <p>1) maximal pupil diameter, 2) minimal pupil diameter, 3) pupil constriction ratio, 4) constriction latency, 5) average constriction velocity, 6) maximal constriction velocity, 7) average dilation velocity, 8) total time taken by the pupil to recover 75% of maximal pupil diameter.</p>