Benefits of matching accommodative demands to vergence demands in a binocular head-mounted display: A study on stereo fusion times

Richard H Y So, W. S. Wong, Romeo Yip, Kwok Cheung Andrew Lam, Patrick Ting

Research output: Journal article publicationJournal articleAcademic researchpeer-review

13 Citations (Scopus)


Current head-mounted displays (HMDs) provide only a fixed lens focus. Viewers have to decouple their accommodation and vergence responses when viewing stereoscopic images presented on an HMD. This study investigates the time taken to fuse a pair of stereoscopic images displayed on an HMD when the accommodative demand is matched to the vergence demand. Four testing conditions exhausting the factorial combinations of accommodative demands (2.5 D and 0.5 D) and vergence demands (2.5 MA and 0.5 MA) were investigated. The results indicate that viewers take a significantly shorter amount of time to fuse a pair of stereoscopic images (i.e., fusion time) when the accommodative demand and the stereoscopic depth cues match. Further analysis suggests that an unnatural demand for the eyes to verge toward stereoscopic images whose stereo depth is farther than the accommodative demand is associated with significantly longer fusion time. This study evaluates the potential benefits of using a dynamically adjustable lens focus in future designs of HMDs.
Original languageEnglish
Pages (from-to)545-558
Number of pages14
JournalPresence: Teleoperators and Virtual Environments
Issue number6
Publication statusPublished - 1 Dec 2011

ASJC Scopus subject areas

  • Software
  • Human-Computer Interaction
  • Computer Vision and Pattern Recognition
  • Control and Systems Engineering

Cite this