# Rayleigh equation

## Ray·leigh e·qua·tion

(rā'lē),
a ratio of red to green required by each observer to match spectral yellow.
Synonym(s): Rayleigh test
Farlex Partner Medical Dictionary © Farlex 2012

## Rayleigh,

Lord John W.S., English physicist and Nobel laureate, 1842-1919.
rayl - unit of acoustic impedance.
Rayleigh equation - a ratio of red to green required by each observer to match spectral yellow. Synonym(s): Rayleigh test
Rayleigh test - Synonym(s): Rayleigh equation

## Rayleigh equation

A colour equation representing a match of yellow (usually 589 nm) with a mixture of red (usually 670 nm) and green (usually 535 nm). It is used to differ-entiate certain types of colour deficiencies. The anomaloscope is built on this principle. See defective colour vision.
Millodot: Dictionary of Optometry and Visual Science, 7th edition. © 2009 Butterworth-Heinemann
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References in periodicals archive ?
In the Rayleigh equation, the mean MMP was 1.04 (SD 0.11).
The Rayleigh equation is an important tool in the assessment of acquired colour vision deficiency and is the test of choice for detecting and diagnosing M-L mechanism deficiencies .
Baseline Number of eyes 19 Rayleigh equation MMP Mean [+ or -] SD 1.04 [+ or -] 0.11 Pseudoprotanomaly (%) 5 (26.3%) Moreland equation MMP Mean [+ or -] SD 0.94 [+ or -] 0.15 Achromatic pattern (%) 84.2% Early follow-up ([less than or equal to]6 months) Number of eyes 15 Rayleigh equation MMP Mean [+ or -] SD 0.98 [+ or -] 0.08 Pseudoprotanomaly (%) 4 (26.7%) Moreland equation MMP Mean [+ or -] SD 1.0 [+ or -] 0.12 Achromatic pattern (%) 93.3% Long-term follow-up Fellow eye (9-31 months) Number of eyes 37 30 Rayleigh equation MMP Mean [+ or -] SD 0.97 [+ or -] 0.08 0.95 [+ or -] 0.08 Pseudoprotanomaly (%) 13 (35.1%) 6 (20%) Moreland equation MMP Mean [+ or -] SD 0.99 [+ or -] 0.11 0.95 [+ or -] 0.12 Achromatic pattern (%) 33 (89.2%) 43.3% MMP, midmatching point; SD, standard deviation.
Kawakami, "Unstable saddle-node connecting orbits in the averaged Duffing Rayleigh equation," ISCAS, vol.
Yue, "Existence and uniqueness of antiperiodic solutions for a kind of Rayleigh equation with two deviating arguments," Nonlinear Analysis, Theory, Methods and Applications, vol.
Liu, "Anti-periodic solutions for a class of nonlinear second-order Rayleigh equations with delays," Communications in Nonlinear Science and Numerical Simulation, vol.
In this present paper, we investigate the existence and uniqueness of the periodic solutions of the following Rayleigh equation with two delays
As we know, Rayleigh equation can be derived from many fields, such as physics, mechanics and engineering technique fields.
In this direction, many researchers (see [4-9]) continued to discuss the Rayleigh equation and got some new results on the T-periodic solutions of Eq.(1.1), and generalized the results in .
Where an exponential enrichment occurs in the residual substrate pool, as in the case of a nitrate pool undergoing denitrification, the [delta][sup.15]N of the residual nitrate increases in proportion to the logarithm of the residual nitrate fraction (Kendall 1998), which can be expressed using the classic Rayleigh equation (Mariotti et al.
Using the Rayleigh equation we calculated a linear relationship between N[O.sub.3]-[delta][sup.15]N and the log (In) of the N[O.sub.3]-N concentration for both topsoil and subsoil, indicating that denitrification was the predominant mechanism of N[O.sub.3]-N loss.
Thus only the roots of the Rayleigh equation [[DELTA].sub.t] = 0 will be considered.

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