title: Visual field examination using a video projector: comparison with Humphrey perimeter.
abstract: OBJECTIVE
  To present a method of visual field examination using a video projector. Also, we compare our results with those of a Humphrey perimeter, which is accepted as standard in automated perimetry.
  
  
  METHODS
  Software implementing a full-threshold 4-2-step staircase algorithm for the central 30-2 of the visual field (76 points) has been developed and tested in nine eyes of seven patients using an Epson TW 700 video projector. The results were compared to those obtained from the same patients using the Humphrey perimeter.
  
  
  RESULTS
  High correlation between the video projector visual fields and those of the Humphrey perimeter was found. The point-to-point correlation coefficient ranged from 0.75 to 0.90, with P<0.0001 for each eye.
  
  
  CONCLUSIONS
  Visual field examination results using a video projector have high correlation with those of a Humphrey perimeter. The method is possibly suitable for clinical use.
authors.affiliation: First Department of Ophthalmology, Medical School, University of Athens, Greece.
authors.forename: Dimitrios
authors.initials: D
authors.lastname: Brouzas
authors.affiliation: First Department of Ophthalmology, Medical School, University of Athens, Greece.
authors.forename: Stylianos
authors.initials: S
authors.lastname: Tsapakis
authors.affiliation: First Department of Ophthalmology, Medical School, University of Athens, Greece.
authors.forename: Eirini
authors.initials: E
authors.lastname: Nitoda
authors.affiliation: First Department of Ophthalmology, Medical School, University of Athens, Greece.
authors.forename: Marilita M
authors.initials: MM
authors.lastname: Moschos
keywords: automated perimetry; computerized perimetry; video projector; visual field software; visual fields