Changes in ocular parameters depending on the motion-in-depth of a three-dimensional display

ObjectiveTo compare changes in ocular parameters after watching a display of three-dimensional (3D) images, with reference to motion-in-depth and viewer age.MethodsA total of 30 healthy subjects were enrolled (of whom 17 were aged 20–30 years and 13, 40–50 years). All subjects watched 3D displays with binocular disparities of 1° or 3° run towards the viewer (who wore polarised glasses) at two defined velocities (slow, 105 mm/s; fast, 257 mm/s) for 15 min at intervals of 1 week. The viewing distance was 1.020 m. The near point of accommodation (NPA) and near point of convergence (NPC), and the tear break-up time (tBUT) of each subject, were measured before and after watching the 3D display. All parameters were repeatedly measured at intervals of 10 min after watching until baseline values became re-established.ResultsNPA and NPC deteriorated more, and tBUT decreased more, after watching a 3D display with fast rather than slow motion-in-depth (all p values