 Experiments with a sample of the normative group were conducted to validate the scale. They checked for normal or corrected normal visual acuity but did not screen for other concomitant conditions, such as oculomotor dysfunction or learning disabilities. The most frequently reported symptoms included text movement, the appearance of color, and eye-strain. Headache, dizziness and visual distortions were reported infrequently. Oral reading rate was highly correlated r .71 with visual discomfort scores. Conlon personal communication has found that individuals with visual discomfort read silently at a normal rate but comprehension suffers, whereas oral reading rate is impaired but comprehension is good. 