: 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
The Orion Nebula, a showpiece easily visible in small scopes or binoculars below Orion’s Belt, is a bright eyepiece-filling gem.
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Jamie Carter, Space.com, 28 Apr. 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
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Jamie Carter, Space.com, 28 Apr. 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
See All Example Sentences for eyepiece
Cite this Entry
“Eyepiece.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/eyepiece. Accessed 4 May. 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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