The effects of lens focus when viewing stereoscopic micro-display images

W. S. Wong, Romeo Yip, Richard So, H. C. Huang, Kwok Cheung Andrew Lam

Research output: Chapter in book / Conference proceedingConference article published in proceeding or bookAcademic researchpeer-review

3 Citations (Scopus)


In a typical Head Mounted Display (HMD), the distance between the lens and the display screen is fixed. When viewing stereoscopic images presented on a HMD with different binocular disparities, viewers are forced to perform vergence without appropriate eye accommodation. This posts an un-natural demand on viewers' eyes. This paper reports the successful development of a HMD with computer-controlled lens focuses and the results of an experiment conducted to study the benefits of appropriate lens focus adjustment on the time taken for viewers to converge a pair of left and right binocular images into a single stereoscopic image. 3D letters were presented with binocular disparities appropriate to a virtual depth of 40cm. Two lens focus adjustments were used: 40cm and infinity. The order of presenting the two lens focus conditions was randomized. Data from ten participants with five repetitions indicate that the participants took significantly less time to converge the left and right images when the lens focus matched with the virtual depth of the images (p<0.0001, ANOVA). The effects of repetitions, participants, and their interactions with the main effects of lens focus are presented.
Original languageEnglish
Title of host publicationProceedings of the Human Factors and Ergonomics Society 50th Annual Meeting, HFES 2006
Number of pages5
Publication statusPublished - 1 Dec 2006
Event50th Annual Meeting of the Human Factors and Ergonomics Society, HFES 2006 - San Francisco, CA, United States
Duration: 16 Oct 200620 Oct 2006


Conference50th Annual Meeting of the Human Factors and Ergonomics Society, HFES 2006
Country/TerritoryUnited States
CitySan Francisco, CA


  • Accommodation
  • Head-mounted display
  • Lens focus
  • Stereopsis
  • Vergence

ASJC Scopus subject areas

  • Human Factors and Ergonomics


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