An anomaloscope for testing the human color sense which includes an optical device for producing a stimulus field including a red/green light mix and light of a yellow spectral color, a device for the mixing of the spectral colors green and red by apportioning them, such that upon strengthening one of them, the respective other one is reduced correspondingly. The anomaloscope further includes intensity control and indicating means for the spectral colors as well as for the portions of green and red determining the anomal quotient. For mixing the red and yellow spectral colors and for creating the stimulus field with a red/green light mix and a field of yellow spectral color, there is provided a partially translucent beam-splitting device arranged at approximately 45 DEG relative to the optical axis of the anomaloscope. The first spectral color yellow and the second spectral color (green or red) illuminates from one side the beam-splitter plane approximately parallel to the optical axis. The third spectral color (red or green) illuminates the beam-splitter plane from the other side in the same area as the second spectral color. The path of rays of the third spectral color strikes the beam-splitter plane perpendicularly relative to the path of rays of the second spectral color.
Anomaloscope