Anomaloscope

anomaloscopeAnomaloscope - a device for determining disorders colour vision. Anomaloscope arranged on the principle of comparing two color fields, one of which has constantly yellow, other, lit red and green rays can change the color tone. In normal colour vision analyzed correctly sets the ratio of the two fields, with the problems colour vision is wrong. In the USSR to produce Spectro-anomaloscopy Rabkin (Fig) and Routine. From foreign models, the most common anomaloscope Nagel.

Anomaloscope (from the Greek. anomalia is a deviation, an irregularity and skopeo - see vetting) - spectral instrument for research of color sense and nature of his illness. For the study of congenital anomalies color vision, the most widespread is anomaloscope Nagel, based on color of Rayleigh equation. In the fall of light from electric lamps on the lens is formed spectral band from which with three openings "cut" three sections of the spectrum - red (l = 670 mμ), green (l = 535 mμ) and yellow (l = 589 mμ). In the preparation of the Rayleigh equation people with normal color vision can see in the hole eyepiece two horizontal fields - one of monochromatic yellow, the other, the resulting color (yellow) from a mixture of two monochromatic red and green. If protanomaly and deuteranomaly (see the colour sensation) this is not a color equality. In the spectral field of anomaloscope Nagel you can get the specified Rayleigh equation, as well as red, yellow and green-yellow equations, which determine the main forms of congenital disorders colour vision.
For clinical diagnostics of congenital and acquired disorders of color vision, as well as for experimental studies used spectrohelioscope Rabkin. With the help of this device is compared by the color of two adjoining vertical spectral fields, each of which is formed monochromatic or a mixture of two monochromatic beams of rays with a given wavelength. In the preparation of the equations of field observations can be adjusted for brightness. In the spectral field of spectrohelioscope Rabkin is possible to make, in addition to the Rayleigh equation, and other color equations all over the spectrum. Using spectrohelioscope you can also explore the spectral sensitivity, absolute thresholds of color sensitivity, functional stability of color vision and contrast sensitivity of the eye.