1973, from tele(vision) + evangelist. Earliest usages are in reference to Rex Humbard (television evangelist is from 1958).
in the figurative sense, 1849, from horses being fitted with blinders to limit the range of their vision (see blinker).
1880, "something wrapped around the head over the eyes to take away vision," from blindfold (v.). Earlier in this sense was blindfolder (1640s).
early 14c., "sign, token; teaching, instruction;" c. 1400, "range of vision," also "mental cognition;" late 15c., "sight, view;" verbal nouns from ken (v.).
1530s, "faint or transient appearance," from glimpse (v.). From 1570s as "a brief and imperfect view." Earlier was the verbal noun glimpsing "imperfect vision" (late 14c.).
"measurement of the range of vision; measurement of the visual powers in general," 1886, from optometer (1738), name given to an instrument for testing vision, from opto- "sight," from Greek optos "seen, visible" (from PIE root *okw- "to see") + -metry "a measuring of." Probably influenced by French optométrie.
When I made the foregoing Experiments, I designed to repeat them with more Care and Exactness, and to make some new ones of the same Sort, by means of an Instrument I had contrived for that Purpose; which from its Use in measuring the Limits of distinct Vision, and in determining with great Exactness the Strength and Weakness of Sight, may be called an Optometer. [Dr. William Porterfield, "An Essay Concerning the Motions of our Eyes, Part II," in Medical Essays and Observations, Vol. IV, Edinburgh, 1738]