Changes in ocular factors transient after watching 3D display, study shows
In a study to investigate changes in ocular factors after watching a three-dimensional display, researchers found that alterations were temporary, especially in cases with a large binocular disparity and in older patients.
Yum and colleagues evaluated 38 patients by measuring the near point of accommodation, the near point of convergence and the tear break-up time both before and after watching a 3D display with a 1° or 3° disparity for 30 minutes. The researchers also tested tear osmolarity, tear meniscus height and depth, and conducted surveys of patient symptoms.
The group published their findings in the British Journal of Ophthalmology.
Results showed that the near point of accommodation and near point of convergence increased after watching 3D content with a 3° disparity, and more so in patients in their 40s and 50s. Tear break-up time and tear meniscus height and depth decreased in the same circumstances and also decreased more so in patients in the same age bracket.
Overall, researchers found that recovery times for both near point of accommodation and near point of convergence were greater in the 40- to 50-years-old age bracket and after watching a 3D display with a 3° disparity.
"Watching a 3D display affects accommodation and convergence abilities and tear dynamics in a transient fashion, especially in the case of 3D images with a large binocular disparity, and in older subjects," the authors concluded. "These results provide helpful information for establishment of guidelines for 3D equipment manufacturers."