Validity of the dyslexia screener.

Optometrists see many patients who complain of reading difficulty. The Dyslexia Screener (TDS) is an instrument which has been developed to determine, within 5 min, whether or not a patient shows evidence of having one of the three basic types of dyslexia (a coding problem in reading and spelling). Results using TDS were compared with the Dyslexia Determination Test (DDT). TDS rating scores were shown to contain much of the same clinical information as the DDT rating scores.