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PURPOSE Any of several conditions can cause asthenopia. The purpose of this study was to determine whether the particular sensations or their location vary dependent on the symptom-inducing condition. METHODS Twenty subjects with good vision performed eight reading tasks in random order during different conditions. Each condition used different stimuli to(More)
PURPOSE To determine the sensitivity of the electromyography (EMG) response of the orbicularis oculi muscle to selected lower-level visually stressful conditions to establish the extent to which it can be used as a measure of visual discomfort. METHODS Thirty-one subjects (18 years or older) with 20/20 vision, without history of ocular pathology,(More)
The luminance surrounding a computer display can potentially reduce visibility of the display (disability glare), result in sensations of discomfort (discomfort glare) and result in transient adaptation effects from fixating back and forth between the two luminance levels. The study objective was to measure the effects of surround luminance levels upon(More)
This study investigated the effect of inter-letter spacing on letter and word recognition over a range of font sizes, font types, and different levels of text familiarity (word frequency). Inter-letter spacing affects the degree of lateral interference form neighboring letters. For commonly used fonts, character spacing is proportional to font size. Since(More)
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