Abstract
A model of the spatial distribution of ERG potentials was used to determine whether blood in the vitreous could sufficiently attenuate potentials initiated in the retina. This topic is of importance to clinicans in helping to determine the functional status of the retina prior to a possible vitrectomy. The results of the model demonstrated that vitreous haemorrhage could not significantly reduce the ERG. Nor could the vitreous blood account for a reduced ratio of b to a waves when ERG frequencies were considered. A reduced or altered ERG Would be due to another cause(s) and might preclude vitrectomy if the function of the retina were impaired.
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