Accommodation/convergence mismatch induced by 3D displays can cause discomfort symptoms such as those induced by accommodation/convergence mismatch in clinical vergence testing. We found that the limits of clear and single vision during vergence tests are very different between 3D and clinical tests. Clinical vergences should not be used as substitutes for measures of vergences in 3D displays.
The purposes of this study were to determine whether the limits of clear and single binocular vision derived from phoropter prism vergence tests match the limits measured in a 3D display and to determine whether vergence mode, smooth versus jump, affected those limits in the 3D display.
We tested the phoropter prism vergence limits of clear and single vision at 40 cm in 47 binocular young adults. In separate sessions, we tested, in a 3D display, the analogous 40-cm vergence limits for smooth vergence and jump vergence. The 3D fixation target was a Maltese cross whose visual angle changed congruently with target disparity.
Our mean phoropter vergence blur and break values were similar to those reported in previous studies. The mean smooth divergence limit was less in the 3D display (9.8Δ) than in the phoropter (12.8Δ). Most smooth convergence limits were much larger in the 3D display than in the phoropter, reaching the 35Δ limit of the 3D display without blur or diplopia in 24 subjects. Mean jump vergence limits were significantly smaller than smooth vergence limits in the 3D display.
The limits of clear and single binocular vision derived from phoropter vergence tests were not a good approximation of the analogous limits in our 3D display.
1New England College of Optometry, Boston, Massachusetts
2Cincinnati Children's Hospital Medical Center—Ophthalmology, Cincinnati, Ohio
Submitted: August 1, 2018
Accepted: July 29, 2019
Funding/Support: National Eye Institute (5T35EY007149; to KMH).
Conflict of Interest Disclosure: None of the authors have reported a financial conflict of interest.
Author Contributions and Acknowledgments: Conceptualization: GLM; Data Curation: KMH; Formal Analysis: GLM, KMH; Funding Acquisition: GLM; Investigation: KMH; Methodology: GLM; Project Administration: GLM; Resources: GLM; Software: GLM; Supervision: GLM; Writing – Original Draft: KMH; Writing – Review & Editing: GLM.
The authors thank Cliff Scott, OD, whose suggestions and encouragement helped to initiate this study, and Ivan Tseng, OD, who helped test some of our subjects.
Online date: November 1, 2019