διοπτεύω

A. watch accurately, spy about, ἠὲ διοπτεύσων Il. 10.451; look into, στέγος S. Aj. 307, cf. Antipho Soph. 6, Critias Fr. 53 D.; δ. τί . . X. Cyr. 8.2.10: c. acc., D.C. 52.37:—Pass., to be overlooked by a neighbour, Agath. 5.6.

II. take a sight, διὰ τοῦ μήκους τῆς σύριγγος Hero Bel. 86.7; esp. through the διόπτρα, Id. Dioptr. 4.