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Medida da função de sensibilidade ao contraste com redes senoidais e E de Snellen em diferentes padrões de perda visual

Medida da função de sensibilidade ao contraste com redes senoidais e E de Snellen em diferentes padrões de perda visual

Autores:

Marco Lico e Cividanes,
Andre Jucá Machado,
Antonio Augusto Velasco e Cruz

ARTIGO ORIGINAL

Arquivos Brasileiros de Oftalmologia

versão impressa ISSN 0004-2749versão On-line ISSN 1678-2925

Arq. Bras. Oftalmol. vol.60 no.2 São Paulo abr. 1997

http://dx.doi.org/10.5935/0004-2749.19970078

SUMMARY

The contrast sensitivity function was measured with sine-wave gratings and the tumbling E in patients with cataract, optic neuropathy and background diabetic retinopathy and compared with a normal control group. For the patients with optic neuropathy the low-frequency lasses were more evident with sine-wave gratings. On the other hand, the high spatial frequency losses showed by the patients with cataract were greater with the tumbling E.

REFERÊNCIAS

1 CAMPBELL, F. W. & MAFFEI, L. - Contrast And spatial frequency. Scientific Am., 231: 2-8, 1974.
2 CRUZ, A. A. V. & MACHADO, A. J. - Sensibilidade ao contraste. Arq. Bras. Oftal., 58: 384-386, 1995.
3 GREEVES, A. L.; COLE, B. L.; JACOBS, R. J. - Reability and validity of simple photographic plate tests of contrast sensitivity. Am. J. Optom. Physiol. Opt. 64: 832-841, 1987.
4 REGAN, D. - Low-contrast letter charts and sinewave grating tests in ophthalmological and neurological disorders. Clin. Vis. Sci., 2: 187-189, 1988.
5 DE VALOIS, R. & DE VALOIS, K. K. - Linear Systems Analysis. IN: DE VALOIS, R. & DE VALOIS, K. K. Spatial Vision. Oxford University Press, New York, 1990, pp. 3-22.
6 CAMPBELL, F. W. & GREEN, D. G. - Optical and retinal factors affecting visual resolution. J. Physiol., 181: 576-593, 1965.
7 REGAN, D.; SILVER, R.; MURRAY, T. J. - Visual acuity and contrast sensitivity in multiple sclerosis-hidden visual loss: an auxiliary diagnostictes. Brain,100: 563-579, 1977.