I just received this email from my friend Eric Thomson:
In the meantime, you might like to try this sovereign remedy from Leechbook III, f.112r:
Gif mist sie fore eagum: nim cildes hlond and huniges tear meng tosomne begea emfela. Smire mid þa eagan innan.
Eft, hrefnes geallan and leaxes and eles and feld beon hunig meng tosomne. Smire mid þære sealfe innan þa eagan.
If mist is before the eyes: take the urine of a child and a tear-like drop of honey. Mix them both together equally. Smear into the eyes with [it].
Afterwards, mix together the gall of a crab and the gall of a salmon and the gall of a lamprey and field bee honey. Smear inside the eyes with that salve.