Mollon-Reffin "Minimal" Vision Test
for colour deficiencies

This vision test examines directly the patient's chromatic discrimination along three theoretically significant axes of colour space.  It is extremely rapid and it offers the simplest possible task to the patient; yet it provides information on the type and the degree of the colour deficiency. 

​Because the task is readily understood and makes minimal demands on the patient’s concentration, the test can be used not only with healthy adults but also with children, with elderly people and with neurological patients.  It has proved especially useful for testing children, since it can be performed even by three-year-olds. 

Those familiar with "arrangement tests" of colour vision (such as the Farnsworth-Munsell 100-hue, the D15 and the tests of Lanthony) will recognise the present test as a considerable improvement on earlier tests.
 
The test will identify and classify the dichromatic type of inherited colour blindness (in this use it replaces the D15 of Farnsworth).  It will also detect those anomalous trichromats who have impaired colour discrimination.  It will pass the small minority of anomalous trichromats who have normal levels of colour discrimination.