div class=ts-pagebuttonPage 1button div class=ts-image a href=https:reader039vdocumentsusreader039viewer2022021919587ee9ea1a28ab17388b6833html5page1jpg target=_blank amp-img class=ts-thumb alt=Page 1: Pupil size research src=https:reader039vdocumentsusreader039viewer2022021919587ee9ea1a28ab17388b6833html5thumbnails1jpg width=142 height=106 layout=responsive amp-imga divpE Shanks PhD 2013pdiv