Accommodation microfluctuations and pupil size during sustained viewing of visual display terminals

L. S. Gray*, B. Gilmartin, B. Winn

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


Accommodation microfluctuations comprise two dominant frequencies; a low frequency component (LFC≤0.6Hz) and a high frequency component (1.0Hz<HFC<2.1Hz). In the present experiment we examine accommodation microfluctuations and steady-state pupil responses during sustained viewing of visual display terminals (VDTs). Steady-state accommodation and pupil responses were measured continuously and simultaneously using a modified Canon Autoref R-1 infra-red objective optometer and an Hamamatsu C3160 Perceptscope Video Area Analyser. Measurements were obtained at three time intervals (0, 10 and 20min) during a 20min reading task presented on five different displays. With the displays placed at 50cm, the task was to locate and identify typographical errors in one of five sets of standard text. Five young visually-normal emmetropic subjects with a mean age of 22.5±3.0 years participated in the study. Two-way ANOVA revealed no significant variation in the magnitude of the accommodation microfluctuations with either display or task duration, nor was there any significant interaction between these two factors. There was no significant variation in mean pupil diameter with either display or task duration. These measures may have the potential to provide objective information about visual display quality. 

Original languageEnglish
Pages (from-to)5-10
Number of pages6
JournalOphthalmic and Physiological Optics
Issue number1
Publication statusPublished - Jan 2000


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