Abstract
THE note by N. I. Pinegin1 suggests a more detailed discussion of the relation between the threshold intensities for scotopic and photopic vision in the ultra-violet. The threshold ratio Tp/Ts is a measure of the intensity range, often misleadingly called 'photochromatic interval', in which the visual impression is free from the specific colour sensation. This intensity range is a marked function of the position of the illuminated area on the retina, the threshold ratio increasing with increasing angle from the fovea. Since Pinegin's note does not contain any data for this angle, it is difficult to draw definite conclusions from his results.
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References
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SCHNEIDER, E. Colour Phenomena in Ultra-Violet Vision. Nature 155, 176 (1945). https://doi.org/10.1038/155176a0
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DOI: https://doi.org/10.1038/155176a0
