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Three members of a family with dominantly inherited juvenile optic atrophy with tritan type of colour vision deficiency all showed dysfunction of the rod mechanism tested with green light after 30 min of dark adaptation. Two subjects had typical optic atrophy, centrocaecal scotoma and lower than normal visual acuity. In 1 subject with good visual acuity of(More)
Visually evoked cortical potentials to reversing checkerboard stimulation were recorded from normal subjects. Different locations of the central visual field of maximally 8 degrees radius were stimulated. Stimulation of various parts of the central visual field changed the waveform and the amplitude of the responses of different subjects very individually.(More)
The psychophysical threshold and the appearance of the visually evoked potential (VEP) were compared in the dark adapted state. Nineteen normal subjects and 11 persons with defective dark adaptation were studied. The VEP threshold was an average of 0.2 log units (standard deviation 0.2) above the subjective threshold in the normal group, and 0.4 log units(More)
Using scotopic visually evoked potentials (VEP), an objective test of concentric absolute field defects is presented. At 0.8 log units above the mean VEP threshold, the full field, the central area of 50 degrees diameter, and the complementary peripheral field were flash stimulated. In 13 normal subjects the peripheral VEP response was larger in amplitude(More)
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