Yes, I have a pair of eyes, replied Sam, and that's just it. If they was a pair o' patent double million magnifyin' gas microscopes of hextra power, p'raps I might be able to see through a flight o' stairs and a deal door; but bein' only eyes, you see my wision's limited.
The Posthumous Papers of the Pickwick Club, Chapter XXXIV (p. 415)