A new screening method for detecting colour vision deficiencies.

Diagnostic colour vision examinations are generally administered with the anomaloscope. But this instrument requires a lot of time and experience for the tests as well as for the interpretation of the results. In practical use, it will be sufficient in most cases to know whether normal colour vision is present or not, and it is not necessary to use sophisticated devices. So it was considered desirable during the TCU conference on colour vision defects held in London in March 1973 [1] to have a testing method for practical use which is both accurate and time saving. At the time when this demand was brought up, a new colour vision test was being developed by Rodenstock [2]. It enables semi-skilled personnel to perform the test independently of ambient light condition in only 20-30 sec and to effect a classification of the type of colour vision at the same time [3].