: 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
GoTo rigs that earn their place by delivering big-aperture views to anyone who prefers glass and eyepieces over screens and sensors.
—
Jamie Carter, Space.com, 18 Feb. 2026
Stand-alone telescope eyepieces with active light amplification do exist for a real-time viewing, but commercial products are pricey, costing hundreds to thousands of dollars.
—Jordan Blanchard, IEEE Spectrum, 4 Jan. 2026
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
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
See All Example Sentences for eyepiece
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Jamie Carter, Space.com, 18 Feb. 2026
Stand-alone telescope eyepieces with active light amplification do exist for a real-time viewing, but commercial products are pricey, costing hundreds to thousands of dollars.
—Jordan Blanchard, IEEE Spectrum, 4 Jan. 2026
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
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
See All Example Sentences for eyepiece
Cite this Entry
“Eyepiece.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/eyepiece. Accessed 25 Feb. 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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