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Thesis

Clinical trials of the Tomlinson Chromatic Flicker color vision test

1 May 1993

Abstract

Pacific University College of Optometry was contracted to evaluate a new color vision test based on the principle of chromatic flicker fusion. A clinical trials was constructed to compare the efficiency and diagnostic capability of this new test to four standard tests commonly found in clinical settings. The Tomlinson test proved to be quick and easy to administer. The the results show that it detects protans with accuracy and sensitivity, but it misdiagnoses many normal and most deutan subjects as tritans. The fact that it is purely a test of foveal color vision is hypothesized to be the reason for the test's tendency to produce tritan false positives. The underlying assumption that all color deficiencies can be gauged on the same scale of luminosity appears to be at the root of the Tomlinson test's failure to clearly reveal deutans.


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