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Journal of the Optical Society of America A
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Journal of the Optical Society of America A
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The Farnsworth Flashlight is not equivalent to the Farnsworth Lantern
Stephen Dain
The Farnsworth Lantern has been accepted in many occupational applications. Modern instruments purporting to be equivalent were inevitable given the ubiquity of its use. The OPTEC900® (Stereo Optical) has been validated and adopted as an acceptable substitute, although the fail rate is ... [J. Opt. Soc. Am. A 29, A377-A382 (2012)]
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Color discrimination across four life decades assessed by the Cambridge Colour Test
Galina V. Paramei
Color discrimination was estimated using the Cambridge Colour Test (CCT) in 160 normal trichromats of four life decades, 20?59 years of age. For each age cohort, medians and tolerance limits of the CCT parameters are tabulated. Compared across the age cohorts (Kruskal?Wallis test), ... [J. Opt. Soc. Am. A 29, A290-A297 (2012)]
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A tritan Waldo would be easier to detect in the periphery than a red/green one: evidence from visual search
Rob N. Dalhaus, Karen L. Gunther
In a color naming task from 0° to 55° eccentricity, we found that red/green performance (n=10 subjects) declines around 40° eccentricity, 5° earlier than does tritan performance (main effect of color, p=0.009; eccentricity, p<0.001; interaction, p=0.005). In a feature ... [J. Opt. Soc. Am. A 29, A298-A305 (2012)]
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Electroretinographic responses to photoreceptor specific sine wave modulation
Jan Kremers, Gobinda Pangeni
Electroretinographic responses to cone and rod isolating stimuli and to simultaneous L- and M-cone modulation were measured at different temporal frequencies between 2 and 60 Hz and at two mean luminances using a four primary stimulator. The responses driven by each photoreceptor type had distinct ... [J. Opt. Soc. Am. A 29, A306-A313 (2012)]
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Psychophysical and physiological responses to gratings with luminance and chromatic components of different spatial frequencies
Bonnie Cooper, Hao Sun, Barry B. Lee
Gratings that contain luminance and chromatic components of different spatial frequencies were used to study the segregation of signals in luminance and chromatic pathways. Psychophysical detection and discrimination thresholds to these compound gratings, with luminance and chromatic components of ... [J. Opt. Soc. Am. A 29, A314-A323 (2012)]
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Quantal and non-quantal color matches: failure of Grassmann?s laws at short wavelengths
Joel Pokorny, Vivianne C. Smith, Jun Xu
Previous studies of color matching found that Grassmann?s laws are not obeyed in the short-wavelength region when the method of maximum saturation matching is compared with Maxwell matching. The first experiment evaluated whether the discrepancy might be due to a discrimination matching ... [J. Opt. Soc. Am. A 29, A324-A336 (2012)]
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The Verriest Lecture: Color lessons from space, time and motion
Steven K. Shevell
The appearance of a chromatic stimulus depends on more than the wavelengths composing it. The scientific literature has countless examples showing that spatial and temporal features of light influence the colors we see. Studying chromatic stimuli that vary over space, time, or direction of motion ... [J. Opt. Soc. Am. A 29, A337-A345 (2012)]
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A three-dimensional color space from the 13th century
Hannah E. Smithson, Greti Dinkova-Bruun, Giles E. M. Gasper, Mike Huxtable, Tom C. B. McLeish, Cecilia Panti
We present a new commentary on Robert Grosseteste?s De colore, a short treatise that dates from the early 13th century, in which Grosseteste constructs a linguistic combinatorial account of color. In contrast to other commentaries (e.g., Kuehni & Schwarz, Color Ordered: A Survey of Color ... [J. Opt. Soc. Am. A 29, A346-A352 (2012)]
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Role of eye movements in chromatic induction
Jeroen J. M. Granzier, Matteo Toscani, Karl R. Gegenfurtner
There exist large interindividual differences in the amount of chromatic induction [Vis. Res.49, 2261 (2009)10.1016/j.visres.2009.06.015]. One possible reason for these differences between subjects could be differences in subjects? eye movements. In experiment 1, subjects either had to look ... [J. Opt. Soc. Am. A 29, A353-A365 (2012)]
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Domain of metamers exciting intrinsically photosensitive retinal ganglion cells (ipRGCs) and rods
Françoise Viénot, Hans Brettel, Tuong-Vi Dang, Jean Le Rohellec
Any stimulus can be described as composed of two components?a fundamental color stimulus that controls the three cone responses and a metameric black that has no effect on cones but can drive photoreceptors other than cones [e.g., rods and melanopsin expressing retinal ganglion cells ... [J. Opt. Soc. Am. A 29, A366-A376 (2012)]
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