Anomaloscopes are used for testing human colour vision and have an optical facility for producing a red, a green and a yellow spectral colour, and a facility for mixing the green and red spectral colours in such a way that, upon intensifying one spectral colour, the other one is in each case correspondingly reduced. In addition, there are means for indicating the intensity of the spectral colours and the proportions of the green and red spectral colours for determining the anomaly quotient. In order to design an anomaloscope of this type with a technically simple structure and with small dimensions, and in which the colour vision can be evaluated using the Rayleigh equation, the light source used for the red and green spectral colours is a two- colour luminescence diode and that for the yellow spectral colour is a single-colour luminescence diode, each having a narrow and differentiated spectral range. The diodes are placed as close together as possible. In order to narrow the spectral range, an interference filter is advantageously arranged in front of each luminescence diode. <IMAGE>
ANOMALOSCOPE