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Optative [of the verb oi)=da]; meaning I would have learned.
[The participle] is ei)dw/s, [genitive] ei)do/tos; and the optative ought to be ei)/doimi, but not ei)dei/hn, since [verbs] which have the participle oxytone ending in -s, declined with [the stem] -nt-, have the optative [ending] in -hn, like tufqei/s, tufqei/hn.[1] But it [ei)dw/s] is not declined with -nt-, and [the optative] should not be ei)dei/hn. But as if with a change of -mi into -hn and of -o- into -e-, [it is] ei)dei/hn. And since the optative is with pure -hn,[2] when the present is perispomenon, like poiw= ["I make", indicative], e)a\n poiw= ["If I make", subjunctive],[3] or if they have the participle [ending] with -s with acute accent, declined with -nt-, [like] darei/s ["having been flayed"], darw= ["I may be flayed"], so given that this [verb] is neither with circumflex accent in the present tense nor has an oxytone participle [ending] with -s declined with -nt- (for [the participle is] ei)dw/s, ei)do/tos), it should not have a circumflex accent; but it does have a circumflex, as has been said,[4] since the optative came to have pure -hn.

*ei)dei/hn: eu)ktikw=s: a)nti\ tou= gnoi/hn. e)/stin ei)dw/s, ei)do/tos: kai\ to\ eu)ktiko\n w)/feilen ei)=nai ei)/doimi, a)ll' ou)k ei)dei/hn, e)peidh\ ta\ e)/xonta th\n metoxh\n ei)s s o)cu/tonon, dia\ tou= nt klinome/nhn, ei)s hn e)/xousi to\ eu)ktiko/n, oi(=on tufqei/s, tufqei/hn. au)to\ de\ ou) kli/netai dia\ tou= nt, kai\ ou)k w)/feilen ei)=nai ei)dei/hn. a)ll' w(/sper troph=| th=s mi ei)s hn kai\ tou= o ei)s e, ei)dei/hn. kai\ e)peidh\ ei)s hn kaqaro/n e)sti to\ eu)ktiko/n, h(ni/ka w)=si meta\ perispwme/nou e)nestw=tos, oi(=on poiw=, e)a\n poiw=, h)\ e)a\n e)/xwsi th\n metoxh\n ei)s s met' o)cei/as dia\ tou= nt klinome/nhn darei/s, darw=. e)n oi(=s ou)=n tou=to ou)/te meta\ perispwme/nou to/nou e)sti tou= e)nestw=tos ou)/te e)/xei th\n metoxh\n ei)s s o)cu/tonon dia\ tou= nt klinome/nhn, ei)dw\s ga\r ei)do/tos, ou)k w)/feile perispa=sqai: a)lla\ periespa/sqh w(s ei)/rhtai: e)peidh\ e)ge/neto to\ eu)ktiko\n ei)s hn kaqaro/n.

For the second and major paragraph here cf. Etymologicum Magnum 296.35-43.
Perfect optatives are rare, and oi)=da is a rare type of perfect, so it would be hard to say what its optative "ought" to be. See also epsiloniota 26.
[1] The present and aorist of -mi verbs and the aorist passive generally have participles which meet these criteria; they do in fact form the optative with the suffix -ih-.
[2] A vowel is called "pure" when it is preceded by a vowel: see LSJ s.v. kaqaro/s 5b.
[3] Contract verbs (which have circumflex accent in the present) also form the optative with the suffix -ih.
[4] This statement about the circumflex accent does not seem applicable to ei)dei/hn.

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