eyepiece

American  

[ahy-pees] / ˈaɪˌpis /

noun

1. the lens or combination of lenses in an optical instrument through which the eye views the image formed by the objective lens or lenses; ocular.

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eyepiece British  

/ ˈaɪˌpiːs /

noun

1. the lens or combination of lenses in an optical instrument nearest the eye of the observer

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eyepiece Scientific  

/ ī′pēs′ /

1. The lens or group of lenses closest to the eye in an optical instrument such as a telescope or microscope.

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Etymology

Origin of eyepiece

First recorded in 1780–90; eye + piece

Example Sentences

Arkapaw: I’m an operator so I love to have my eyepiece to the camera and Ryan sits right next to me.

From Los Angeles Times • Jan. 22, 2026

A magnifying eyepiece, produced by 3D printing, fits cellphone cameras and takes photos of microscope slides; AI image analysis then picks out and identifies pathogens.

From Seattle Times • Sep. 24, 2023

Those phases are more than just a lovely sight at the eyepiece.

From Scientific American • Jun. 2, 2023

I climbed a few steps to reach the telescope’s eyepiece, pointed at a star 25.3 light-years from Earth.

From New York Times • Aug. 24, 2022

Sherman went first, pressing his eye against the eyepiece.

From "October Sky" by Homer Hickam