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Critical frequency of photic driving: Which part of the visual pathway do we examine?
Author(s) -
Shpak Alexander A.
Publication year - 1992
Publication title -
acta ophthalmologica
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.534
H-Index - 87
eISSN - 1755-3768
pISSN - 1755-375X
DOI - 10.1111/j.1755-3768.1992.tb02137.x
Subject(s) - foveal , photic zone , photic stimulation , light sensitivity , visual field , ophthalmology , audiology , atrophy , medicine , neuroscience , psychology , optics , physics , retinal , visual perception , chemistry , phytoplankton , organic chemistry , nutrient , perception
Studies on critical frequency of photic driving were performed on patients with optic atrophy, moderately expressed suprachiasmal lesions and normal subjects. A reduction was present only in optic atrophy patients. The critical frequency of photic driving showed significant correlations with visual acuity and differential light sensitivity of the areas located within 15° from the fixation point. The correlation proved higher for foveal sensitivity expressed in non‐logarithmic rather than in logarithmic units, the opposite being the case for the sensitivity of parafoveal areas. It may be concluded that critical frequency of photic driving is conditioned by the cortical projection zones and visual pathways corresponding to the central 15° of the visual field, but with predominant role of foveal projections.