: the lens or combination of lenses at the eye end of an optical instrument
Examples of eyepiece in a Sentence
Recent Examples on the Web
Beneath the dome, the 57-foot-long Great Refractor telescope is wrapped in black plastic tarps from eyepiece to lens assembly.
—
Ethan Baron, Mercury News, 31 Dec. 2025
As with Jupiter, locate it using the red dot finder and the low-power eyepiece before swapping to high-power.
—Jamie Carter, Space.com, 26 Dec. 2025
The eyepieces have large (21 mm) eye lenses and they're deeply recessed in the eye cups, which allows for nearly a full field of view even when wearing glasses.
—Scott Gilbertson, Wired News, 1 Dec. 2025
As before, budding stargazers don't get closer to galaxies and nebulae through an eyepiece, that sort of thing is handled by the smart part of this equation.
—New Atlas, 21 Nov. 2025
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Ethan Baron, Mercury News, 31 Dec. 2025
As with Jupiter, locate it using the red dot finder and the low-power eyepiece before swapping to high-power.
—Jamie Carter, Space.com, 26 Dec. 2025
The eyepieces have large (21 mm) eye lenses and they're deeply recessed in the eye cups, which allows for nearly a full field of view even when wearing glasses.
—Scott Gilbertson, Wired News, 1 Dec. 2025
As before, budding stargazers don't get closer to galaxies and nebulae through an eyepiece, that sort of thing is handled by the smart part of this equation.
—New Atlas, 21 Nov. 2025
See All Example Sentences for eyepiece
Cite this Entry
“Eyepiece.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/eyepiece. Accessed 7 Jan. 2026.
Copy CitationKids Definition
eyepiece
noun
eye·piece
ˈī-ˌpēs 
: the lens or combination of lenses at the eye end of an optical instrument (as a microscope or telescope)
Medical Definition
eyepiece
noun
eye·piece
ˈī-ˌpēs
: the lens or combination of lenses at the eye end of an optical instrument
called also ocular
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