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Electroretinographic assessment of early changes in ocular siderosis.

We examined a patient with an iron intraocular foreign body and recorded electroretinograms (ERGs) before and after the removal of the foreign body by vitrectomy. The amplitudes of the rod and cone ERGs and the oscillatory potentials (OPs) in the injured eye were reduced before the operation. In addition, the photopic on-responses (b wave) were more reduced than off-responses (d wave). One year after surgery, the amplitudes of the rod, cone and photopic on- and off-responses were markedly improved to within the low normal limit. However, the OP amplitudes remained unchanged with lower values. These findings suggest that iron retinotoxicity leads to a dysfunction of all layers but the changes may be reversible in the early period of the disease. The late period iron toxicity produces more severe damage to the inner retina than the outer retina.

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