This article provides a terminological framework to show the relationships among different types of visual deficits. It distinguishes between visual functions, which describe how the eye and the lower visual system function, and functional vision, which describes how a person functions. When visual functions are disturbed, the term "visual…

Presents a theoretical model of reading that takes into account the principal differences between skilled and deficient readers; describes a study that tested the relevance of the model by comparing good, average, and poor partially sighted readers and by studying how training affected the reading process. (GT)