: 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
In the case of amateur telescopes, the light bounces off the primary mirror and is reflected by a smaller secondary mirror to a focal point at the eyepiece.
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Keith Cooper, Space.com, 17 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
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Keith Cooper, Space.com, 17 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 27 Apr. 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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