The optative with ἄν (the potential optative) may be used as the apodosis of
εἰ with the indicative in Simple Present and Past conditions ( cross2300 e),
εἰ with the past indicative in Unreal conditions in Homer (rarely in Attic, cross2312),
εἰ with the future indicative in Emotional Future conditions ( cross2328),
ἐά_ν with the subjunctive in More Vivid Future conditions ( cross2326 d).
a. When the protasis is a future indicative or a subjunctive, the optative with ἄν sometimes seems to be merely a mild future and to have no potential force. Thus, ἢν οὖν μάθῃς μοι τὸν ἄδικον τοῦτον λόγον, οὐκ ἂν ἀποδοίην οὐδ' ἂν ὀβολὸν οὐδενί
Herbert Weir Smyth [n.d.], A Greek Grammar for Colleges; Machine readable text [info] [word count] [Smyth].