Preferred position of visual displays relative to the eyes: a field study of visual strain and individual differences

Article Abstract:

A field study was conducted to investigate individual differences on preferred positions for visual display unit (VDU) screens that will provide low visual strain. Workers of a telephone directory assistance office, which were given workstations having adjustable table heights for both keyboard and screen, were observed. Results of the study show that VDU users preferred viewing distances between 60 and 100 cm and a vertical inclination of gaze direction between horizontal and -16 degrees downwards as this position reduces visual strain and discomfort.

Health aspects, Computers, Eyestrain, Asthenopia, Optical equipment

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Accommodation, convergence, pupil diameter and eye blinks at a CRT display flickering near fusion limit

Article Abstract:

The visual functions are affected by non-visible intermittent light stimulation in the range of typical cathode ray tube (CRT) refresh rates. The effects can also influence visual fatigue. The pupil is 0.055 millimeter smaller at a repetition rate of 50 hertz than at 300 hertz. However, this does not affect the precision of convergence or accommodation in binocular vision. The mean accommodation is 0.06 diopter lower, the median eye blink duration is 6% shorter and the mean eye blink interval is 15% longer in monocular vision.

Physiological aspects, Convergence (Biology), Convergent evolution, Ocular refraction, Binocular vision, Pupil (Eye), Cathodoluminescence

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No evidence for prolonged latency of saccadic eye movements due to intermittent light of a CRT computer screen

Article Abstract:

Efforts made to examine whether saccadic eye movements across computer screens may be effected by the intermittency of light of cathode ray tubes (CRT) is presented. The results suggested that the intermittent light of cathode ray tube screens does not prolong the latency of saccades.

Instruments and Related Products Manufacturing for Measuring, Displaying, and Controlling Industrial Process Variables, Science & research, Electronic components, not elsewhere classified, Other Electronic Component Manufacturing, Display Devices, Annunciators, Gauges & Displays, Eye movements

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