Electroretinographic Measurement of the Spectral Sensitivity in Albinos, Caucasians, and Negroes

Dodt, E.; Copenhaver, Richard M.; Gunkel, Ralph D.

doi:10.1001/archopht.1959.04220050057010

Cited by 34 publications

(11 citation statements)

References 6 publications

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“…The present study revealed significant differences between subjects with light and dark fundi for b-wave amplitude and for the L-R function measures Vmax and n. The only other known ERG studies comparing subjects with different pigmentations (skin) are those of Schmidt [18] and Dodt et al [19]. Schmidt [18] compared the dark-adapted ERGs of one black, two white blondes and a black-albino child under nonganzfeld conditions.…”

Section: Discussionmentioning

confidence: 55%

“…No clear differences could be determined between the albino and the 'controls'. Dodt et al [19] compared the relative spectral sensitivities of the photopic component of the ERG with a flickering stimulus in albinos, whites and blacks. They found that spectral sensitivity increased with decreased pigmentation at wavelengths longer than 600 nm but not at the shorter wavelengths.…”

Section: Discussionmentioning

confidence: 99%

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Fundus pigmentation and the dark-adapted electroretinogram

Wali

Leguire

1992

Doc Ophthalmol

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Dark-adapted electroretinograms were obtained over a 3.6-log range of stimulus intensities from 17 black and 15 white normal subjects. Subjects were grouped on the basis of light or dark fundus pigmentation, determined from digitized fundus photographs. B-wave amplitudes for each group were fitted by the Naka-Rushton equation, and the measures Vmax, log K, and n were determined. The luminance-response functions revealed that subjects with light fundi had larger b-wave amplitudes at all luminance levels. There was a significant difference between groups for Vmax and n but not for log K. A comparison of b-wave implicit times showed no significant difference between subjects with dark and light fundi. Ancillary tests and multiple regression analysis suggested that the relationship between Vmax and fundus pigmentation could not be attributed to age, gender, refractive error, axial length or intraocular pressure. The results have implications for the collection of normative electroretinographic data and for the interpretation of electroretinogram results.

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Section: Discussionmentioning

confidence: 55%

Section: Discussionmentioning

confidence: 99%

Fundus pigmentation and the dark-adapted electroretinogram

Wali

Leguire

1992

Doc Ophthalmol

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“…along with other variable effects depending on the pigmen tation status of the animals [Sthele et al. 1988] and the existence of different luminous spectral sensitivities as detected in electroretinograms from albino and pigmented rats [Dodt et al, 1959;Reuter. 1977], lends support to these hypotheses.…”

Section: Discussionmentioning

confidence: 99%

Pineal ‘Synaptic Ribbons’ and Serum Melatonin Levels in the Rat following the Pulse Action of 52-Gs (50-Hz) Magnetic Fields: An Evolutive Analysis over 21 Days

Soriano

González²,

Armañazas³

et al. 1992

Cells Tissues Organs

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In continuation of earlier studies, we have investigated the influence of 52-Gs (50-Hz) magnetic fields on the evolution of pinealocyte ‘synaptic ribbons’ and serum melatonin levels in rats, following 30 min daily exposure. The animals were sacrificed after 1, 3, 7, 15 and 21 days. A significant decrease in the number of synaptic ribbons was observed after 15 and 21 days, together with a significant drop in serum melatonin concentrations after 15 days. The mediating role of the retina in these modifications and magnetic field effects is discussed.

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“…This light is a result of a pigment deficiency in the choroid. This factor has been suggested as the cause 0fthe increase in efficiency of light on the ERG from the dark-adapted albino retina (Krill and Lee, 1963;Dodt et al, 1959). Additionally, the displacement of the bipolar and ganglion cells and the presence of the Henle fiber layer have also been specifically suggested as the cause of reduced scattering within the foveal region of normal eyes .…”

Section: Discussionmentioning

confidence: 99%

“…If this functional interpretation is accepted, the Stiles-Crawford effect could play a role of great importance in the eyes of albinos, since the translucency of the iris (Donaldson, 1974) and the pigment deficiency of the choroid (Dodt et al, 1959;Krill and Lee, 1963) both are presumed to increase the amount of diffuse stray light in the albino eye beyond a normal level. Methods aimed at reducing stray light have been used with some degree of success in the improvement of the visual functions of albinos (Edmunds, 1949;Miller et al, 1972).…”

Section: Introductionmentioning

confidence: 99%

The Stiles-Crawford function of an albino observer

et al. 1982

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Stiles--Crawford functions (SCF's) were measured for both eyes of an albino observer with a marked pendular nystagmus using an eye position monitoring system. Both eyes demonstrated directional sensitivity as revealed by their SCF's. The directional sensitivity of both eyes was less than that of either the foveal or parafoveal region of normal observers. In addition, there was a significant difference between the SCF's for the albino observer's two eyes. Our results suggest that the psychophysical SCF is predominantly the result of the orientational distribution of groups of receptors on the retina.

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Electroretinographic Measurement of the Spectral Sensitivity in Albinos, Caucasians, and Negroes

Cited by 34 publications

References 6 publications

Fundus pigmentation and the dark-adapted electroretinogram

Fundus pigmentation and the dark-adapted electroretinogram

Pineal ‘Synaptic Ribbons’ and Serum Melatonin Levels in the Rat following the Pulse Action of 52-Gs (50-Hz) Magnetic Fields: An Evolutive Analysis over 21 Days

The Stiles-Crawford function of an albino observer

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