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PubMed1979

Assessment of the visual acuity of human color mechanisms with the visually evoked cortical potential.

The amplitude of the human visually evoked cortical potential (VECP), which has been shown to vary as a function of the dimensions of checks in a checkerboard pattern, was used to objectively assess the visual acuity of the blue-sensitive compared with the red- and green-sensitive mechanisms in the eye. The results agree with psychophysical measures which have indicated poorer acuity of the blue system compared with the red and green systems.

Adult↗
PubMed1979

[Study of colour vision and visual evoked responses in multisclerosis diagnosis (author's transl)].

In a patient with suspected Multisclerosis (M.S.), the discovery of a lesion in the anterior optic tracks is of considerable diagnostic importance. If none of the classical clinical signs of optic neuritis can be found, the study of visual evoked responses (VER) and of colour vision is useful evidence for diagnosis. In a population of 102 patients having "possible", "probable" or "confirmed" M.S, we have compared the information provided by both these methods. 27 patients had MS with a known optic neuritis: the VER and colour vision of all of them was altered, either unilaterally or bilaterally. 75 patients had "possible" or "probable" MS without a history of optic neuritis. For 34,7%, the discovery of a dyschromatopsia showed a lesion in the optic nerve. In 68%, only the increased latency in VER demonstrated an optic neuritis. It should be noted that for all the patients with "probable" or "confirmed" MS, the VER latency was increased. The study of colour vision is therefore in our opinion, an excellent way of investigating anterior optic tracks lesions. When the study of colour vision is not sufficient, the recording of VER is a reliable technique and a very valuable acquisition in neuro-ophthalmology.

Adult↗