To look (or see) through a millstone. To be wonderfully sharp-sighted.
“Then … since your eies are so sharp that you can not only looke through a milstone, but cleane through the minde …”—Lilly: Euphues, etc.
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Entry taken from Dictionary of Phrase and Fable, edited by the Rev. E. Cobham Brewer, LL.D. and revised in 1895.