Editor,—Long acting periocular corticosteroids are commonly used to treat cystoid macular oedema (CMO) resulting from ocular inflammation or cataract surgery that does not respond to topical therapy. Drug localisation to the macular area is considered important for optimal therapeutic effect. In post-cataract CMO refractory to topical therapy, corticosteroids delivered by retrobulbar and posterior sub-Tenon's injections are equally effective.1 Steroids given by sub-Tenon's injection have previously been shown to localise to the macular area.2Retrobulbar anaesthetic injections have been shown to localise in the intraconal space, but not precisely to the macular area.34 We performed ultrasonography after retrobulbar steroid injection to confirm drug localisation in the macular area.