Abstract
The Farnsworth-Munsell 100-hue test (FM 100-hue) has been subject to a variety of sophisticated analyses in recent years including conversion to uniform color space and Fourier analysis of error patterns. The majority of acquired color defects seen by clinicians, often assessed by the FM 100-hue or by arrangement tests, arise from retinal or optic nerve disorders. Chromatic discrimination at the retinal level is well described within cone excitation space. Retinal and optic nerve disorders should show chromatic discrimination loss along ‘critical axes’ in cone excitation space. We therefore calculated cap locations in the MacLeod-Boynton cone excitation space, where S/(L + M) cone excitation is plotted vs L/(L + M) cone excitation in a constant luminance plane. The FM 100-hue cap locations form an ellipse tilted from the S and L/(L + M) axes. Excitation on one or the other axis gives an approximately sinusoidal error pattern as a function of cap number, but the separation is not 90°. Error patterns for congenital and acquired defects can be predicted and compared with data. Normal FM 100-hue test error scores can be plotted on a Δl/l template. A similar approach can be taken for arrangement tests and confusion errors can be plotted on the template. The results are consistent with chromatic discrimination data as a function of test illuminance.
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Smith, V.C., Pokorny, J., Yeh, T. (1993). The Farnsworth-Munsell 100-hue test in cone excitation space. In: Drum, B. (eds) Colour Vision Deficiencies XI. Documenta Ophthalmologica Proceedings Series, vol 56. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-1856-9_29
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DOI: https://doi.org/10.1007/978-94-011-1856-9_29
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