: the lens or combination of lenses at the eye end of an optical instrument
Examples of eyepiece in a Sentence
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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.
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Scott Gilbertson, Wired News, 1 Dec. 2025
To calculate the all-important usable magnification, divide the focal length of the telescope by the focal length of the eyepiece.
—Jamie Carter, Space.com, 30 Nov. 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
This reference is why many place the innovation of the eyepieces to the 13th century (specifically: 1287).
—Daniel Fusch, Ascend Agency, 11 Nov. 2025
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Scott Gilbertson, Wired News, 1 Dec. 2025
To calculate the all-important usable magnification, divide the focal length of the telescope by the focal length of the eyepiece.
—Jamie Carter, Space.com, 30 Nov. 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
This reference is why many place the innovation of the eyepieces to the 13th century (specifically: 1287).
—Daniel Fusch, Ascend Agency, 11 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 17 Dec. 2025.
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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