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Testing for this study of age and colour vision was begun in 1955 and nearly completed by 1958. It was in that year that application for admission as a Ph.D. Student of Edinburgh University was made. Although the basic facts of this study collected from 1955-58 are embodied in this thesis, a great deal of material from further experimenting, analysing and testing is also included. The main subjects of the thesis are :- (A) A historical survey of previous studies on the problem of age and colour vision. This will deal with researches up till 1957 and will include an evaluation of the discrepancies between the various studies. (B) A quantitative analysis of results obtained from the study for this thesis. This will include a discussion of performances on the various pseudoisochromatic tests, and on the Pickford anomoloscope. In addition, a colorimetric and photometric study will be made of the tests used in the researches on age and colour vision. This will lead to an analysis of what is actually tested by the colour vision tests used by various research workers. (C) Conclusions reached from this study and a comparison of the results of this work with the results of other researchers, both prior to 1957 and since then.