E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
Cast of the Eye (A).
A squint. One meaning of the word cast is to twist or warp. Thus, a fabric is said to cast when it warps; and seamen speak of casting, or turning the head of a ship on the tack it is to sail. We also speak of a casting or turning vote.
My goode bowe clene cast [twisted] on one side.Ascham: Toxophilus.