Abstract
While the relation of convergence eye movement and lens accommodation is well established, the roles played by pupillary near reflex in near response are controversial. We tested this contribution by analyzing eye and pupil movements evoked by ordinary and three-dimensional (2D and 3D) movies with known disparity and luminosity. Eye and pupil movements in both eyes were continuously monitored by a newly-developed video-based dual eye/pupil meter. Ten subjects watched 2D/3D movies in dark room (10 lux) with polarized glasses. The movies were presented on an 80 inch screen by two liquid crystalline projectors with polarized filters to provide binocular disparity field-sequentially. Pupillary responses while watching 2D and 3D movies were almost coherent. Then pupillary reflexes were mainly dependent on change in the luminance of the movies (pupillary light reflex). However, small 2D/3D differences were still detected. Convergence eye movements, measured as the difference between right and left eye while subjects were watching 3D movie, were dependent on the magnitude of the disparities, although small movements were still elicited by 2D movies. Based on analyses of the relation among small differences in pupil between 2D/3D conditions, convergence movements, and luminosity and disparity of the image, we discuss the roles of the pupillary near reflex in the near response. [Jpn J Physiol 55 Suppl:S170 (2005)]
