The scotopic luminance-time relation and its possible wavelength dependence on the chromatic aberration of the eye

Year: 1973

Authors: Ronchi L., Molesini G.

Autors Affiliation: Istituto Nazionale di Ottica, Largo E. Fermi 6, 50125 Firenze, Italy

Abstract: The luminance-time relation is recorded at absolute threshold by flashing a small test spot at 7° and at 15° along the horizontal meridian of the dark-adapted retina. It is found to show a variation of wavelength dependence. In view of the fact that the luminance-time relation depends on stimulus size, the question is rised whether our date are invalidated by some phenomenon, such as, for instance, the blur due to the chromatic aberration of the eye. Neither the change of the spectral composition of the fixation light, nor the use of ophthalmic lenses of 1-3 dioptres are found to alter the shape of the luminance-time relation across the spectrum (except for very long wavelengths). It is as if the population of receptors mediating the response at absolute threshold were not so homogeneous as is currently shown in experiments where the temporal aspect of the visual process is not directly involved.

Journal/Review: BRITISH JOURNAL OF PHYSIOLOGICAL OPTICS

Volume: 28 (3)      Pages from: 162  to: 168

KeyWords: Dark Adaptation; Human; Light; Photic Stimulation; Time Factors; Visual Perception; Chromosome aberration; Eye; Luminance; Methodology; Night vision; Retina;

Citations: 1
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