Prolonged complementary chromatopsia in users of video display terminals.

Induced prolonged complementary chromatopsia in four subjects (two men, 26 and 34 years old, and two women, 34 and 45 years old) was documented by abnormal responses to pseudoisochromatic color plates 30 minutes after cessation of monochrome video display terminal use. This phenomenon was unrelated to preexisting color vision anomalies, known ocular disease, or drug use, and defines a specific phenomenon probably related to afterimages. All four patients missed AOH-R-R plate 3 after using the video display terminal. One patient also had a delayed response to plate 6. One patient patched one eye before using the video display terminal and noted that the complementary chromatopsia occurred only in the unpatched eye.