Impairment of color spatial vision in chronic alcoholism measured by psychophysical methods.

Castro, Antonio; Rodrigues, Anderson Raiol; Côrtes, Maria Izabel Tentes; Silveira, Luiz Carlos de Lima

doi:10.3922/j.psns.2009.2.009

Cited by 17 publications

(14 citation statements)

References 58 publications

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“…On the other hand, they do not corroborate the results of Castro et al (2009), as these authors have shown no change in visual CS achromatic related to chronic alcohol consumption. However, it is important to note that these studies have methodological features that prevent a direct comparison between the results.…”

Section: Discussioncontrasting

confidence: 54%

“…Among the changes in visual perception associated with alcohol use, we highlight: (i) neurodegenerative alterations in visual pathways and retinal layers integrated into the functional decline of rods and cones (Lima et al 2006); (ii) alterations in cortical receptive fields of single cells and hypercomplex selective visual spatial orientation (Medina, Krahe, & Ramoa, 2005); and (iii) alterations in visual processing of chromatic and achromatic stimuli (Castro et al 2009;Chen, Xia, Li, & Zhou, 2010;Rosenbloom et al, 2004;Wegner, Günthner, & Fahle, 2001).…”

Section: Introductionmentioning

confidence: 99%

“…The contrast sensitivity was measured to visually achromatic sinusoidal grating with a spatial frequency of 0.2 to 30 cycles per degree of visual angle (cpd), using the psychophysical method of adjustment (Castro et al, 2009). The results showed no statistical difference in the visual achromatic CS between alcoholic patients and healthy volunteers.…”

Section: Introductionmentioning

confidence: 99%

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Effects of chronic alcoholism in the sensitivity to luminance contrast in vertical sinusoidal gratings

Cruz

Andrade

Cavalcanti-Gaudino

et al. 2016

Psicol. Refl. Crít.

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The aim of this study was to measure visual contrast sensitivity (CS) of luminance using vertical sinusoidal gratings with spatial frequencies of 0.6, 2.5, 5.0 and 20.0 cycles per degree of visual angle in chronic alcoholics in abstinence period. The participants were 20 volunteers (26-59 years of age) divided into two groups: the study group (SG) consisted of 10 volunteers with a clinical history of chronic alcoholism abstinence and the control group (CG) consisted of 10 healthy volunteers. Each group had five female and five male participants. All participants had normal or corrected visual acuity and were free of identifiable diseases. The psychophysical method of forced choice between two temporal alternatives (2AFC) was used to measure visual CS of luminance of 41.2 cd/m 2 . The results showed significant differences between groups for all spatial frequencies tested (p < 0.001). These results suggest alterations in the visual perception related to chronic alcohol consumption even after years of abstinence.

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Section: Discussioncontrasting

confidence: 54%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effects of chronic alcoholism in the sensitivity to luminance contrast in vertical sinusoidal gratings

Cruz

Andrade

Cavalcanti-Gaudino

et al. 2016

Psicol. Refl. Crít.

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“…Visto que a função de sensibilidade ao contraste espacial de luminância representa a atividade de vários canais corticais seletivos a bandas de frequências espaciais e que eles podem representar pelo menos parcialmente a atividade das vias paralelas retino-genículo-estriadas M e P, muitos trabalhos têm buscado investigá-la com intuito de avaliar a visão espacial em condições mórbidas e avaliar se há um comprometimento funcional prioritário de algum dos canais de processamento espacial. A função de sensibilidade ao contraste espacial de luminância já foi utilizada como método investigativo da função visual em estudos com pacientes que sofrem de doenças degenerativas como glaucoma (Motolko;Phelps, 1984), catarata (Drews-Bankiewicz et al, 1992), ambliopia (Volkers et al, 1987), diabetes (Sokol et al, 1985;Liska;Dostálek, 1999), esclerose múltipla (Kupersmith et al, 1984) e acidente vascular encefálico Andrade, 2012); doenças infeciosas como hanseníase (Daniel et al, 2005) e tuberculose (Woung et al, 1995); doenças neurotóxicas como intoxicação por solventes orgânicos (Lacerda et al, 2012), mercúrio (Rodrigues et al, 2007) e álcool etílico (Castro et al, 2009); e desnutrição (Dos Santos et al, 2009).…”

Section: Aplicação Clínica Da Função De Sensibilidade Ao Contraste Esunclassified

A visão através dos contrastes

Souza¹,

Lacerda²,

Silveira³

et al. 2013

Estud. av.

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O processamento visual de contrastes s radiações eletromagnéticas dentro da faixa de comprimentos de ondas entre aproximadamente 380 nm e 760 nm vindas do ambiente entram em contato com fotorreceptores na retina e podem ser convertidas em sinais eletroquímicos (Luo, 1999). Esses sinais são transmitidos e codificados através de redes neuronais que levam, entre outros efeitos, à geração da percepção visual consciente. Desde a recepção da energia eletromagnética até a geração da percepção consciente, ocorrem diversos processos de codificação da informação cuja compreensão é fundamental para entender-se como a visão funciona. Os processos mais distais são mais bem entendidos, enquanto aqueles que ocorrem progressivamente mais centralmente são da mesma forma progressivamente menos entendidos.Nos fotorreceptores, a codificação da informação luminosa ocorre através da transdução da quantidade de fótons absorvidos pelos fotopigmentos em amplitudes de alterações graduadas do potencial de membrana da célula fotorreceptora Pugh Jr., 1992;2006). As respostas elétricas dos fotorreceptores aos estímulos luminosos são hiperpolarizantes (Naka; Rushton, 1966). Em síntese, os fotorreceptores funcionam como contadores dos fótons absorvidos, em outras palavras, do número de eventos de absorção de fótons pelos fotopigmentos que levam a fotoisomerizações desses fotopigmentos e ativação da cascata de fototransdução Pugh Jr., 1992; Yau, 1994).A partir da próxima etapa do processamento visual, a sinapse entre fotorreceptores e células bipolares, inicia-se uma transformação da informação luminosa. As células bipolares comparam as informações oriundas de diferentes fotorreceptores, fazendo surgir pela primeira vez dentro do processamento visual a informação de contraste (Werblin; Dowling, 1969; Zhang; Wu, 2009). As células bipolares fazem a codificação de contraste graças à organização de seus campos receptivos com diferentes propriedades de ativação / inibição entre as áreas centrais e periféricas desses campos. A estrutura do campo receptivo com antagonismo funcional entre seu centro e periferia é o circuito básico para o processamento da informação espacial no sistema visual. A geração da oponência entre centro e periferia dos campos receptivos das células bipolares tem origem em acoplamentos entre células bipolares e na combinação de várias vias sinápticas mediadas por células horizontais e amácrinas (para maiores detalhes

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“…Classical studies using Farnsworth-Munsell 28-hue or 100-hue color-arrangement tests showed high incidence of colour vision losses in chronic alcohol consumers [ 10 , 15 ]. In addition, it was demonstrated that subjects with history of alcoholism exhibit colour vision changes without impairment of spatial luminance contrast sensitivity [ 18 ]. Several studies tried to characterize specific visual deficits associated with alcohol consumption, but the results were contradictory [ 16 , 18 ].…”

Section: Introductionmentioning

confidence: 99%

Colour Vision Impairment in Young Alcohol Consumers

et al. 2015

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Alcohol consumption among young adults is widely accepted in modern society and may be the starting point for abusive use of alcohol at later stages of life. Chronic alcohol exposure can lead to visual function impairment. In the present study, we investigated the spatial luminance contrast sensitivity, colour arrangement ability, and colour discrimination thresholds on young adults that weekly consume alcoholic beverages without clinical concerns. Twenty-four young adults were evaluated by an ophthalmologist and performed three psychophysical tests to evaluate their vision functions. We estimated the spatial luminance contrast sensitivity function at 11 spatial frequencies ranging from 0.1 to 30 cycles/degree. No difference in contrast sensitivity was observed comparing alcohol consumers and control subjects. For the evaluation of colour vision, we used the Farnsworth-Munsell 100 hue test (FM 100 test) to test subject’s ability to perform a colour arrangement task and the Mollon-Reffin test (MR test) to measure subject’s colour discrimination thresholds. Alcohol consumers made more mistakes than controls in the FM100 test, and their mistakes were diffusely distributed in the FM colour space without any colour axis preference. Alcohol consumers also performed worse than controls in the MR test and had higher colour discrimination thresholds compared to controls around three different reference points of a perceptually homogeneous colour space, the CIE 1976 chromaticity diagram. There was no colour axis preference in the threshold elevation observed among alcoholic subjects. Young adult weekly alcohol consumers showed subclinical colour vision losses with preservation of spatial luminance contrast sensitivity. Adolescence and young adult age are periods of important neurological development and alcohol exposure during this period of life might be responsible for deficits in visual functions, especially colour vision that is very sensitive to neurotoxicants.

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Impairment of color spatial vision in chronic alcoholism measured by psychophysical methods.

Cited by 17 publications

References 58 publications

Effects of chronic alcoholism in the sensitivity to luminance contrast in vertical sinusoidal gratings

Effects of chronic alcoholism in the sensitivity to luminance contrast in vertical sinusoidal gratings

A visão através dos contrastes

Colour Vision Impairment in Young Alcohol Consumers

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