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In this report we recommend the estimation of visual acuity by detection of the visual evoked potential (VEP) threshold, defined by the smallest visual angle of a constant check size that evokes potentials. This approach was implemented using a fiber-optic pattern-reversal stimulator placed at measured, increasing distances from the examined eye. Snellen visual acuity as determined in 113 subjects was correlated with the VEP detection threshold. A highly significant correlation was found between visual acuity and the threshold visual angle of check size in subjects whose vision was impaired due to opacity in ocular media. For any given visual acuity a somewhat wide range of threshold check sizes, typically 5-10 min of arc was observed. Technical difficulties that need to be overcome to improve these results are discussed.
Y Raniel, and
H Pratt, and
E Neumann, and
S E Schacham
May 1994,
Graefe's archive for clinical and experimental ophthalmology = Albrecht von Graefes Archiv fur klinische und experimentelle Ophthalmologie,
Y Raniel, and
H Pratt, and
E Neumann, and
S E Schacham
January 1994,
Ophthalmic research,
Y Raniel, and
H Pratt, and
E Neumann, and
S E Schacham
July 2022,
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Y Raniel, and
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S E Schacham
July 1979,
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Y Raniel, and
H Pratt, and
E Neumann, and
S E Schacham
October 1985,
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Y Raniel, and
H Pratt, and
E Neumann, and
S E Schacham
April 2011,
Fa yi xue za zhi,
Y Raniel, and
H Pratt, and
E Neumann, and
S E Schacham
March 1996,
Vision research,
Y Raniel, and
H Pratt, and
E Neumann, and
S E Schacham
November 1997,
Graefe's archive for clinical and experimental ophthalmology = Albrecht von Graefes Archiv fur klinische und experimentelle Ophthalmologie,
Y Raniel, and
H Pratt, and
E Neumann, and
S E Schacham
January 1989,
Ophthalmologica. Journal international d'ophtalmologie. International journal of ophthalmology. Zeitschrift fur Augenheilkunde,
Y Raniel, and
H Pratt, and
E Neumann, and
S E Schacham
August 1997,
Nippon Ganka Gakkai zasshi,
