Thirty patients on long-term benzodiazepine medication were subjected to fu
ll ophthalmoscopic examination. Of these 19 (63.3%) complained of symptoms
of irritation, blurred vision or difficulty in reading. None, however, had
reduced visual acuities apart from two where the cause was longstanding amb
lyopia. Thirteen patients had some form of retinal finding, 9 macular and 4
non-macular. Of the 14 who presented for flash and pattern electroretinogr
aphy (ERG), none showed any abnormality which could be ascribed to the medi
cation, its total dose, or duration. We conclude, on the basis of the evide
nce from this small cohort, that long-term benzodiazepine medication has li
ttle effect upon retinal function as signalled by the ERG.