John R. Hayes

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Effects of font design and electronic display parameters upon text legibility were determined using a threshold size method. Participants' visual acuity (inverse of the minimum detection size, representing the threshold legibility for each condition) was measured using upper- and lowercase letters and lowercase words in combinations of 6 fonts, 3(More)
PURPOSE We propose that eyelid squint can reduce the impact of several conditions known to cause eyestrain such as uncorrected refractive error, accommodative dysfunction, presbyopia, and glare. Clinicians commonly accept that squint improves visual acuity (VA) in the presence of refractive error, and even though the benefit of eyelid squint in bright light(More)
10 ClearType is an onscreen text rendering technology in which the red, green, and blue sub-pixels are separately addressed to increase 11 text legibility. However, it results in colored borders on characters that can be bothersome. This paper describes five experiments mea-12 suring subject preference, text legibility, reading performance, and discomfort(More)
We have developed a simple direct execution architecture for a 32 bit Forth microprocessor. The processor can directly access a linear address space of over 4 gigawords. Two instruction types are defined; a subroutine call, and a user defined microcode instruction. On-chip stack caches allow most Forth primitives to execute in a single cycle.
Introduction Robert Morris College in Pittsburgh, Pennsylvania, is a small private college (approx. 5,000 students, 110 full-time faculty) that emphasizes undergraduate and graduate instruction in business. Its degree programs include a strong foundation in the liberal arts. Robert Morris College prides itself on its commitment to teaching. The faculty of(More)
Previous studies have shown that, when presented in rapid stream (i.e., RSVP paradigm), word recognition speed for strings of three-letter words increases approximately 10% with large letter spacing, both in the fovea and the periphery (up to 10° eccentricity). A possible explanation is that small spacing may cause features of individual characters to(More)
PURPOSE Asthenopia has been associated with reading under visually stressful conditions. However, it is not known whether increased cognitive load contributes to asthenopic symptoms. The purpose of this study was to evaluate the contribution of increased cognitive load (with or without visual stress inducing conditions) to asthenopic symptoms associated(More)