Visual field examination using a video projector: comparison with Humphrey perimeter
Dimitrios Brouzas, Stylianos Tsapakis, Eirini Nitoda, Marilita M Moschos
First Department of Ophthalmology, Medical School, University of Athens, Greece
Purpose: 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.
Materials and 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.
Conclusion: 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.
Keywords: visual fields, video projector, computerized perimetry, automated perimetry, visual field software
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