Etymology
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eye (n.)

c. 1200, from Old English ege (Mercian), eage (West Saxon) "eye; region around the eye; apperture, hole," from Proto-Germanic *augon (source also of Old Saxon aga, Old Frisian age, Old Norse auga, Swedish öga, Danish øie, Middle Dutch oghe, Dutch oog, Old High German ouga, German Auge, Gothic augo "eye"). Apparently the Germanic form evolved irregularly from PIE root *okw- "to see."

HAMLET: My father — methinks I see my father.
HORATIO: Where, my lord?
HAMLET: In my mind's eye, Horatio.

Until late 14c. the English plural was in -an, hence modern dialectal plural een, ene. Of potatoes from 1670s. Of peacock feathers from late 14c. As a loop used with a hook in fastening (clothes, etc.) from 1590s. The eye of a needle was in Old English. As "the center of revolution" of anything from 1760. Nautical in the wind's eye "in the direction of the wind" is from 1560s.

To see eye to eye is from Isaiah lii.8. Eye contact attested from 1953. To have (or keep) an eye on "keep under supervision" is attested from early 15c. To have eyes for "be interested in or attracted to" is from 1736; make eyes at in the romance sense is from 1837; gleam in (someone's) eye (n.) "barely formed idea" is from 1959. Eye-biter was an old name for "a sort of witch who bewitches with the eyes."

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eye (v.)
early 15c., "cause to see;" 1560s, "behold, observe," from eye (n.). Related: Eyed; eyeing.
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eye-liner (n.)
also eyeliner, 1955, in the cosmetic sense, from eye (n.) + liner (n.2).
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pink-eye (n.)

contagious eye infection, 1882, American English, from pink (adj.) + eye (n.). Earlier it meant "a small eye" (1570s).

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eye-shadow (n.)
also eyeshadow, 1918 in the cosmetic sense, in Elizabeth Arden ads in "Cosmopolitan," from eye (n.) + shadow (n.).
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eye-opener (n.)
"anything that informs and enlightens," 1863, from eye (n.) + agent noun from open (v.). Earlier "alcoholic drink" especially one taken early in the day (1818).
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eye-catching (adj.)
1799, from eye (n.) + present participle of catch (v.). Eye-catcher (n.) is from 1882, first in advertising; eye-trap (n.) is attested from 1785.
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eye-drop (n.)
also eyedrop, 1590s, "tear," from eye (n.) + drop (n.). From 1938 as "a drop for the eye." Related: Eye-dropper.
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eye-shade (n.)

also eyeshade, "a shade for the eyes," 1808 as a type of headgear, from eye (n.) + shade (n.).

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eye-service (n.)
"work done only under inspection or while the master is watching," 1530s, from eye (n.) + service (n.1). Related: Eye-servant.
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