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Faster saccades, increased reading speed and less microsaccades were found under high screen luminance.
However, the reason why some of these measures are sensitive to screen luminance while other to ambient illuminance remains unknown.
Results showed that reading under high levels of screen luminance increases visual fatigue, as reflected by a decrease of eye blinks.
We investigated the conjoint effect of screen luminance and ambient illuminance on visual fatigue and arousal during prolonged digital reading (one hour) by means of a multidimensional approach based on eye, performance and subjective measures.
Two levels of screen luminance (low, high) and two levels of ambient illuminance (low, high) were tested in a 2 × 2 between-subjects design in which participants were arbitrarily allocated to four groups, one for each combined level of luminance and illuminance.
The peak screen luminance, measured using a photometer (Minolta CS-100, Konica Minolta, Japan) was 145 cd/m2 when viewed through the touch screen panel.
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In addition, an identical parallel comparison was conducted to examine how pupil size co-varied with other measures during the two baseline videos, when it was not possible to control for on-screen luminance.
For pupil size, however, it was necessary to introduce a separate baseline recording, since pupil size is strongly influenced by on-screen luminance levels and it was not possible to control where on-screen the infants looked while viewing the videos.
While screens of mobile devices are not suitable for the primary interpretation of projectional radiographs or mammography, screen resolution, luminance and pixel size of these devices are sufficient for a technically adequate display of computed tomography (CT) examinations.
However, it remains possible that the visual display and the screen-edge luminance contribute to changes in occipital activity, specifically within the anterior parts of the calcarine representing eccentric parts of the visual field.
On each trial, stimuli were presented for 0.2 sec and separated by a 0.5 sec interval containing a blank screen of mean luminance.
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CEO of Professional Science Editing for Scientists @ prosciediting.com