RDSs presented in an operant conditioning paradigm have resulted in improved therapy for patients with accommodative and vergence dysfunctions. Numerous studies have demonstrated that computerization of VT techniques are superior to traditional methods of therapy. Computerization improves patient motivation, eliminates experimental bias, simplifies therapy goals, provides immediate reinforcement to encourage correct responding, and provides meaningful data to evaluate progress. The significant and increasing number of home computers and the policies of managed care have fostered the use of computer based VT to supplement office therapy or be a stand alone modality for home based therapy. Dr. Cooper is a developer of the Computer Orthoptor TM and HTSTM and has a financial interest in these systems.