The study examined whether individual levels of optimal illumination could be reliably determined for visually impaired adults and whether the level identified in the assessment had validity in relation to a practical reading task. The assessment procedure was found to be reliable and valid and reading performance improved. (Author/DB)

This article illustrates use of the alternating treatment design to assess effectiveness of individualized interventions in low vision rehabilitation. The design was used to determine whether enlarging copy (to one of two magnification levels) and adding contrast would be effective in reducing the time a visually impaired student required to read…