title: Visual Evoked Potential Using Head-Mounted Display Versus Cathode Ray Tube: A Pilot Study.
abstract: OBJECTIVE
  To present a new stimulation method based on the use of a head-mounted display (HMD) during pattern reversal visual evoked potential (PR-VEP) testing and to compare variables of HMD to those of conventional cathode ray tube (CRT).
  
  
  METHODS
  Twenty-three normal subjects without visual problems were recruited. PR-VEPs were generated using CRT or HMD stimuli. VEP outcome measures included latencies (N75, P100, and N145) and peak-to-peak amplitudes (N75-P100 and P100-N145). Subjective discomfort associated with HMD was determined using a self-administered questionnaire.
  
  
  RESULTS
  PR-VEPs generated by HMD stimuli showed typical triphasic waveforms, the components of which were found to be correlated with those obtained using conventional CRT stimuli. Self-administered discomfort questionnaires revealed that HMD was more comfortable in some aspects. It allowed subjects to concentrate better than CRT.
  
  
  CONCLUSIONS
  The described HMD stimulation can be used as an alternative to the standard CRT stimulation for PR-VEPs. PR-VEP testing using HMD has potential applications in clinical practice and visual system research because HMD can be used on a wider range of subjects compared to CRT.
authors.affiliation: Department of Rehabilitation Medicine and Research Institute of Rehabilitation Medicine, Yonsei University College of Medicine, Seoul, Korea.
authors.forename: Hyo Seon
authors.initials: HS
authors.lastname: Choi
authors.affiliation: Department of Rehabilitation Medicine, CHA Bundang Medical Center, CHA University, Seongnam, Korea.
authors.forename: Sang Hee
authors.initials: SH
authors.lastname: Im
authors.affiliation: Department of Physical Medicine and Rehabilitation, Myongji Hospital, Seonam University College of Medicine, Goyang, Korea.
authors.forename: Yong Kyun
authors.initials: YK
authors.lastname: Kim
authors.affiliation: Department of Rehabilitation Medicine and Research Institute of Rehabilitation Medicine, Yonsei University College of Medicine, Seoul, Korea.
authors.forename: Sang Chul
authors.initials: SC
authors.lastname: Lee
keywords: Cathode ray tube; Head-mounted display; Visual evoked potentials