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It is evident that penicillin F did not cause any damage to the retina or other parts of the interior of the eye when 1,000 units was introduced. Penicillin X was well tolerated in the dose of 2,000 units. Circumscribed lesions of the retina, as observed with the preparation of penicillin G used in this series, were absent. When the dose of penicillin X was increased to 5,000 units, there was a localized area of injury in the neuroepithelium in 1 of 4 eyes. The retina was unchanged after injections of 2,000 units of commercial crystalline sodiumpenicillin.
A look at the past . . .. Arch Ophthalmol. 2008;126(5):625. doi:10.1001/archopht.126.5.625