| abstract |
A method and apparatus for determining the colour discrimination of the vision of a subject in which light of a predetermined reference colour is compared with a plurality of lights of different test colours, one of which is preferably identical with the reference colour, and diluting the coloured lights with a diluting colour, and changing the relative intensity of dilution therebetween and measuring the value of said relative dilution when the subject attempts to match the reference light with one of the test colours. |