PubMed · 1070880
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W O Taylor, G B Donaldson. 1976. Recent developments in Farnsworth's colour vision tests.. https://pubmed.ncbi.nlm.nih.gov/1070880/
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The Berson test for blue cone monochromatism discriminates X-linked blue cone monochromatism from achromatopsia but not from X-linked progressive c dystrophy.
This computer program is designed for faster elaboration of the Farnsworth-Munsell 100-Hue test. It is thus made user friendly, in that faultless input of data can be achieved, even by an untrained person. Evaluation is facilitated by the opportunity of representing two results at the same time. Examples of typical colour vision deficiencies are stored in a file and can then also be called up. Storing the results in a special data file helps to avoid the time consuming printing process. However, a hardcopy is supported by storing the last grafic in a standard PostScript-file, thus giving easy access to any printer. This program is applicable for IBM- or compatible PCs. Extensive use is possible by means of a software interface with the wide spread database-system DBASE.
A new method of measuring normal hue discrimination ellipses and dichromatic zones using a high resolution colour monitor is described. The test involves the detection of chromatic bars on a grey background (x = 0.305, y = 0.323) having a luminance of 34 cd m-2. Elements of the background matrix of square checks are varied randomly in luminance in space and time to provide random luminance masking (RLM) which compensates for differences in the relative luminous efficiency of different observers. The measurement technique provides a rapid and comprehensive colour vision test. Typical results are presented for normal trichromats, protanopes and deuteranopes without RLM and with the RLM set of 25%. The size of the discrimination ellipse in normal observers is the same in both viewing conditions, but the use of the RLM technique reveals the extent of the isochromatic zones in colour deficient observers.