Results 151 to 160 of about 11,072 (199)
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Documenta Ophthalmologica, 1988
In congenital total color blindness direct current recordings of the electroretinogram displayed a negativity following the b-wave, not present in recordings of normal eyes. This negativity, preceding the onset of the c-wave, is probably caused by the lack of cone contribution to the positive c-wave component.
A, Thaler, M R, Lessel, P, Heilig
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In congenital total color blindness direct current recordings of the electroretinogram displayed a negativity following the b-wave, not present in recordings of normal eyes. This negativity, preceding the onset of the c-wave, is probably caused by the lack of cone contribution to the positive c-wave component.
A, Thaler, M R, Lessel, P, Heilig
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Temporal summation in the achromat
Vision Research, 1988We investigated temporal summation of the rods in a complete achromat, who lacks cone vision. Critical duration (tc) was estimated both at the achromat's preferred area of fixation and at an area 12 deg laterally in the nasal visual field. Comparable tc determinations were made in a normal trichromat. At background luminances of 0.0 and 0.6 scot.
L T, Sharpe, C, Fach, K, Nordby
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Applied Optics, 2006
The principles of wavefront reconstruction by means of a geometric-optical reflection of radiation from surfaces of interference fringe maxima are discussed. The optical elements based on these principles should be achromatic. Two methods of the optical elements design are proposed. The first method is a direct holographic recording of the interference
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The principles of wavefront reconstruction by means of a geometric-optical reflection of radiation from surfaces of interference fringe maxima are discussed. The optical elements based on these principles should be achromatic. Two methods of the optical elements design are proposed. The first method is a direct holographic recording of the interference
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Achromatic polarization rotator
Applied Optics, 2007What we believe to be a new optical element consisting of a single piece isotropic material with three internally reflecting faces for polarization plane rotation by the angle phi=pi/2 is proposed. The principle of operation is based on the geometrical phase effect, which is different in its origin but produces a similar effect to the circular ...
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Approximation Algorithms for the Achromatic Number
Journal of Algorithms, 2001Summary: The achromatic number for a graph \(G=\langle V,E \rangle\) is the largest integer \(m\) such that there is a partition of \(V\) into disjoint independent sets \(V_1,\dots,V_m\) such that for each pair of distinct sets \(V_i\), \(V_j\), \(V_i\cup V_j\) is not an independent set in \textit{G. M. Yannakakis} and \textit{F. Gavril} [SIAM J. Appl.
CHAUDHARY, A, VISHWANATHAN, S
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Journal of the Optical Society of America, 1970
This paper constitutes a mathematical elaboration, in a form permitting direct predictions of data, of the empirical discoveries of Helson and Michels concerning the “effect of chromatic adaptation on achromaticity.” An equation is developed permitting the chromaticity of a test spot that appears achromatic against an extended chromatic background to ...
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This paper constitutes a mathematical elaboration, in a form permitting direct predictions of data, of the empirical discoveries of Helson and Michels concerning the “effect of chromatic adaptation on achromaticity.” An equation is developed permitting the chromaticity of a test spot that appears achromatic against an extended chromatic background to ...
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Achromatic optomechanical modulator
Applied Optics, 1986We present details of the construction and performance of an optomechanical amplitude modulator. The heart of the modulator is an oscillating small mirror which makes it a low-power low-voltage device. The modulation frequency is fixed, but, in our model, it can be changed from 10 to 20 kHz by simple adjustments, and the modulator has high transmission.
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Phenomenal Transparency in Achromatic Checkerboards
Perceptual and Motor Skills, 1999The study explored the luminance relations that determine the occurrence of achromatic transparency in phenomenal surfaces on complex backgrounds. Let the luminances of the left and right parts of a transparent surface on a bipartite background and those of the left and right parts of the bipartite background be p and q and m and n, respectively ...
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Achromatic color vision-I: Perceptive variables of achromatic colors
Vision Research, 1974Abstract Achromatic colors are usually considered to be specifiable by a single perceptive variable, although a few bidimensional systems for specification of such colors have previously been presented. Some of the most important concepts of achromatic color are reviewed, and evaluated against the color variations observable in a disc-ring ...
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Broadband Achromatic Metasurfaces for Longwave Infrared Applications
Nanomaterials, 2021Yuanhang Zhao, Nianxi Xu
exaly