A simple anomaloscope for measuring variations of colour vision and colour blindness

Pickford, R. W.

doi:10.1016/s0001-6918(59)80141-4

Cited by 9 publications

(11 citation statements)

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“…The P-N anomaloscope is also well suited for studying acquired color defects [25] because it evaluates three color matching ratios: red-green, blue-yellow and green-blue. The procedures used with this anomaloscope complied with those recommended by Pickford [35].…”

Section: Equipmentmentioning

confidence: 99%

The effect of a moderate level of hypoxia on human color vision

Vingrys

Garner

1987

Doc Ophthalmol

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This study reports the effect of a moderate level of hypoxia on human color discimination. We found a generalized loss of color vision affecting both red-green and blue-yellow discrimination at an altitude of 12,000 feet. Although the residual color discrimination at this altitude was within age-matched, sea-level norms, a statistically significant increase over sea level error scores was measured on the Farnsworth-Munsell 100-Hue test and the Pickford-Nicolson anomaloscope. An analysis of psychophysical and electrophysiological studies indicates that hypoxia acts by depressing retinal ganglion cell activity and that it can affect photopic visual processes as well as scotopic vision. We conclude that studies evaluating man's visual performance at altitude must consider post-receptoral processes.

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Section: Equipmentmentioning

confidence: 99%

The effect of a moderate level of hypoxia on human color vision

Vingrys

Garner

1987

Doc Ophthalmol

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“…2) had minor defects [Polland and Nordstrom, 1979J. The tests were made in a calibrated anomaloscope according to Pickford [1957bPickford [ , 1959.…”

Section: Resultsmentioning

confidence: 99%

Different Expressions of One Gene for Congenital Achromatopsia with Amblyopia in Northern Sweden

Nordström¹,

Polland²

1980

Hum Hered

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Congenital achromatopsia with amblyopia is a recessive disorder. The authors report the origin of 9 cases in 4 sibships from one small parish in northern Sweden suggesting a gene source for achromatopsia in this population. The study confirms that complete and incomplete achromatopsia might be different expressions of the same gene. A tendency towards a heterozygotic manifestation of the gene was found.

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“…The Pickford-Nicolson anomaloscope. P-N anomaloscope (Pickford 1957, Pickford & Lakowski 1960) is a simple colorimeter employing filtered light which passes through a viewing aperture which subtends an angle of 1.5' at the eye at a distance of 1 metre. The viewing aperture is split vertically into two parts, a standard and a variable, where the standard is the stimulus to be matched by a mixture of two primaries of the variable.…”

Section: Methodsmentioning

confidence: 99%

Tobacco Amblyopia and Acquired Dyschromatopsia Anomaloscope Tests

Bhargava

1973

Acta Ophthalmologica

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The colour vision of 12 patients with tobacco amblyopia and 12 normal controls matched for age and sex was tested with the Pickford-Nicolson anomaloscope and the Farnsworth-Munsell 100-Hue test. The results of the two tests were correlated (p=+0.768, P < 0.01) in that the higher the matching range on the P-N anomaloscope, the greater is the error score on the 100-Hue test in tobacco amblyopia. The matching range (t = 9.78, P < 0.001) and the 100-Hue test (t = 5.43, P < 0.001) score were significantly higher than those of the controls. The acquired colour defect in tobacco amblyopia with the P-N anomaloscope is of extreme protanomalous type -the mean mid-matching point being shifted towards the red by more than the 3 x s.d. limits for the normal controls.

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A simple anomaloscope for measuring variations of colour vision and colour blindness

Cited by 9 publications

References 0 publications

The effect of a moderate level of hypoxia on human color vision

The effect of a moderate level of hypoxia on human color vision

Different Expressions of One Gene for Congenital Achromatopsia with Amblyopia in Northern Sweden

Tobacco Amblyopia and Acquired Dyschromatopsia Anomaloscope Tests

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