The article reviews three studies (EC 600 064-066) evaluating the effectiveness of using Irlen tinted lenses or overlays with reading-disabled persons. It is concluded that carefully designed and controlled studies do not currently lend support to the Irlen hypothesis. (DB)

The article examines the concepts of power and control in research design and applies them to a review of the validity of three studies (EC 600 064-066) evaluating the effectiveness of using Irlen tinted lenses with reading-disabled persons. Internal validity, external validity, statistical conclusion validity, and construct validity are…

Although color vision deficiency is a prevalent problem in childhood, little is known about the cognitive and social-emotional variables linked to this difficulty. A review of the literature revealed seven empirical articles exploring the psychological functioning of color-deficient children, with the results yielding contradictory findings. The…