Three cases are recorded to whom color vision was restored in the course of treatment. The patients had not realized their color blindness before they were able to see colors. Color vision was, at the beginning, accompanied by fright. One of the patients ceased to hear music as a disagreeable noise: he began to enjoy it, and was able to carry a tune. The variations of color experience in the dreams of the patients are described. During the course of treatment, a change from twilight vision to a simple vivid type and then to complicated colors was observed in the dreams of the patients.