Revelation of Jesus Christ
From the KJV 1611 with Strong's Concordance
G3700
ὀπτάνομαι
optanomai
{op-tan'-om-ahee}
The first a (middle voice) prolonged form of the second (primary) which is used for it in certin tenses; and both as alternates of G3708; to gaze (that is, with wide open eyes, as at something remarkable; and thus differing from G0991, which denotes simply voluntary observation; and from G1492, which expresses merely mechanical, passive or casual vision; while G2300, and still more emphatically its intensive G2334, signifies an earnest but more continued inspection; and G4648 a watching from a distance).
NOTE: Used widely throughout the New Testament (below are the usages from Revelation only).
seen
Revelation 11:19.