 Reading can be especially difficult for those with visual discomfort because most printed text is a repetitive striped pattern with the same characteristics that cause visual discomfort; that is, spatial frequencies between 1-6 cycles deg-1 Legge et al., 1985, high contrast, and 50 duty cycle Wilkins Nimmo-Smith, 1984; 1987. Those with visual discomfort report a variety of symptoms when they read, such as, movement of print, blurring, letter distortion size, doubling, fading or darkening, patterns appearing in white spaces, color illusions as letter highlights or moving blobs, nausea, dizziness, headache, eye-strain, and glare discomfort Wilkins, 2003. One study Wilkins Nimmo-Smith, 1987 found that decreasing the duty cycle double or triple spacing the lines of text was sufficient to reduce or eliminate most of the unpleasant symptoms. 