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At the second stage ophthalmological status (acuity of vision and refraction) was estimated as well as functional (critical flicker fusion frequency -CFFF) electrophysiological (electrosensitivity threshold -EST; electrolabilityEL), phychophysiological (channel capacity- CC, visual information volume -VIV, visual information speed -VIS, efficiency of visual information analysis -EVIA) investigations were carried out [4, 5].
The flicker fusion frequency was determined by comparing the power spectrum of the averaged response at each stimulus frequency (signal) to the power spectrum of a neighboring frequency (noise) and was defined as the frequency at which the power of the signal fell below the power of the noise.