• WordNet 3.6
    • n eyepiece combination of lenses at the viewing end of optical instruments
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Webster's Revised Unabridged Dictionary
    • eyepiece an eyepiece consisting of two plano-convex lenses with their curved surfaces turned toward the object glass, and separated from each other by about half the sum of their focal distances, the image viewed by the eye being formed between the two lenses. it was devised by Huyghens, who applied it to the telescope. Campani applied it to the microscope, whence it is sometimes called Campani's eyepiece.
    • n eyepiece (Opt) The lens, or combination of lenses, at the eye end of a microscope, telescope or other optical instrument, through which the image formed by the mirror or object glass is viewed.
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Century Dictionary and Cyclopedia
    • n eyepiece In an optical instrument, the lens or combination of lenses to which the eye is applied.
    • n eyepiece In entomology, the eye-covering in the pupæ of lepidopterous insects.
    • n eyepiece An eyepiece with right-angled reflection-prism attached to the eye-lens, so that the observer looks in at the side, perpendicularly to the axis of the instrument.
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In literature:

Evarts could dimly see his long, grave profile bending over his eyepiece, shrouded in the heavy shadows across the table.
"The Man Who Rocked the Earth" by Arthur Train
When the Very Young Man's turn came he looked into the eyepiece awkwardly.
"The Girl in the Golden Atom" by Raymond King Cummings
The left eyepiece still seemed to be functioning.
"Planet of the Damned" by Harry Harrison
He turned from the eyepiece with a face grown hard and cold.
"The Passing of Ku Sui" by Anthony Gilmore
You focus the 'scope eyepiece by turning this knurled knob.
"The Flying Stingaree" by Harold Leland Goodwin
Harl continued to gaze through the eyepiece of the detecting instrument.
"Astounding Stories, April, 1931" by Various
He turned the eyepiece over to Dr. Miller.
"The Blue Ghost Mystery" by Harold Leland Goodwin
With his face pressed against the eyepiece, he scanned the moonlit ocean in a slow circle.
"Way of a Rebel" by Walter M. Miller
Haines set up one of the launching racks, which was equipped with a telescopic sighter, and peered through the eyepiece.
"The Secret of the Ninth Planet" by Donald Allen Wollheim
Beware of the popular error that an object held close in front of a telescope can be seen by an observer at the eyepiece.
"A Text-Book of Astronomy" by George C. Comstock
The left eyepiece still seemed to be functioning.
"Sense of Obligation" by Henry Maxwell Dempsey (AKA Harry Harrison)
Yet the film formed by the breath of the observer on the eyepiece of a telescope would obscure Jupiter.
"The Universe a Vast Electric Organism" by George Woodward Warder
For visual observation the Crossley telescope is provided with seven eyepieces, with powers ranging from 620 downward.
"Photographs of Nebulæ and Clusters" by James Edward Keeler
The analyzer fits over the eyepiece on the tube.
"Paint Technology and Tests" by Henry A. Gardner
It should be placed between the eye and eyepiece.
"Scientific American, Vol. XXXIX.--No. 24. [New Series.], December 14, 1878" by Various
Frequent examination of the eyepiece should be made and the eyepiece cooled if necessary.
"Astronomy" by David Todd
The telescope= consists of two lenses, the eyepiece and the objective.
"Physics" by Willis Eugene Tower
He lowered the periscope till the eyepiece was level with the deck, and stood drumming his fingers against the hoisting wires.
"The Story of Our Submarines" by John Graham Bower
A refracting telescope is one of the ordinary pocket type, having an object-lens at one end and an eyepiece at the other.
"The Romance of Modern Invention" by Archibald Williams
The height of the cloud above the horizon is found by reading the position of the eyepiece on the divided quadrant.
"Practical Exercises in Elementary Meteorology" by Robert DeCourcy Ward

In news:

Scientist Says McDonald's Staff Tried To Pull Off His Google-Glass-Like Eyepiece, Then Threw Him Out.
Tele Vue Optics' Delos EDL-17.3mm eyepiece has a 72° apparent field of view, a 21.2-millimeter field stop, and 20mm of eye relief.
Scientist Says McDonald's Staff Tried To Pull Off His Google-Glass-Like Eyepiece , Then Threw Him Out.
Scientist Says McDonald's Staff Tried To Pull Off His Google- Glass-Like Eyepiece, Then Threw Him Out.
A photo from Mann's computer eyepiece allegedly showing McDonald's staff tearing up a doctor's note explaining his need to wear the device.
This planetary nebula offers a great show through the eyepiece.
This pocket microscope features a built-in LED light that provides a bright, clear image and a rubberized eyepiece for comfortable viewing.
For microscope users who wear eyeglasses or those who suffer from eye or neck strain, a new enlarged eyepiece just might be the answer.

In science:

Astronomy began as a visual science, first through careful observations of the sky using either an eyepiece or the naked eye, then on to the preservation of those images with photographic media and finally the digital encoding of that information via CCDs.
Sky in Google Earth: The Next Frontier in Astronomical Data Discovery and Visualization
The achromatic image plane can be sent either onto a CCD or an eyepiece for control. A small mask is placed at the focal plane of the ”field telescope”, eliminating residual light from the 0 and -1 diffraction orders of the Fresnel array located 23 m upstream.
Fresnel Interferometric Imager: ground-based prototype
Indeed, Airy rings around the twin images were indeed often observed at the DIMM’s eyepiece.
Site testing in summer at Dome C, Antarctica