Résumé
The aim of this study was to assess contrast sensitivity for angular frequency stimuli as well as for sine-wave gratings in adults under the effect of acute ingestion of alcohol. We measured the contrast sensitivity function (CSF) for gratings of 0.25, 1.25, 2.5, 4, 10, and 20 cycles per degree of visual angle (cpd) as well as for angular frequency stimuli of 1, 2, 4, 24, 48, and 96 cycles/360°. Twenty adults free of ocular diseases, with normal or corrected-to-normal visual acuity, and no history of alcoholism were enrolled in two experimental groups: 1) no alcohol intake (control group) and 2) alcohol ingestion (experimental group). The average concentration of alcohol in the experimental group was set to about 0.08%. We used a paradigm involving a forced-choice method. Maximum sensitivity to contrast for sine-wave gratings in the two groups occurred at 4 cpd sine-wave gratings and at 24 and 48 cycles/360° for angular frequency stimuli. Significant changes in contrast sensitivity were observed after alcohol intake compared with the control condition at spatial frequency of 4 cpd and 1, 24, and 48 cycles/360° for angular frequency stimuli. Alcohol intake seems to affect the processing of sine-wave gratings at maximum sensitivity and at the low and high frequency ends for angular frequency stimuli, both under photopic luminance conditions.
Sujets)
Adulte , Femelle , Humains , Mâle , Jeune adulte , Consommation d'alcool/physiopathologie , Consommation d'alcool/psychologie , Sensibilité au contraste/effets des médicaments et des substances chimiques , Analyse de Fourier , Vision des couleurs/effets des médicaments et des substances chimiques , Éthanol/analyse , Psychophysique/méthodes , Littérature de revue comme sujet , Perception de la taille , Analyse et exécution des tâches , Acuité visuelle , Perception visuelle/effets des médicaments et des substances chimiquesRésumé
OBJETIVOS: Avaliar, em mulheres em idade fértil, a associação entre o uso de anticoncepcionais (ACO) orais de baixa dosagem e alterações na visão de cores. MÉTODOS: Foram incluídas no estudo 30 mulheres, 16 usuárias de ACO oral há menos de cinco anos (Grupo I) e 14 usuárias de anticoncepcionais orais há mais de cinco anos (Grupo II). Foram utilizados os testes de Ishihara, City University Color Vision Test e D 15 dessaturado. RESULTADOS: Não foram observados padrões característicos de distúrbio da visão cromática em nenhum teste dos dois grupos. CONCLUSÃO: Na amostra estudada, o uso de ACO oral de baixa dosagem não influenciou a visão de cores, independente do tempo de uso.
PURPOSE: To evaluate the association between oral low-dose contraceptives and color vision alterations. METHODS: Were included in the study 30 women, sixteen used oral contraceptive for less than five years (Group I) and 14 used it for more than five years (Group II). The Ishihara, City University Color Vision Test, and the D 15 desaturated tests were used. RESULTS: No characteristic alterations in the chromatic perception were found in any of the groups. CONCLUSION: In the studied sample, low-dose oral contraceptive has not influenced color vision, independent of the time of use.