1. The lens or group of lenses in an optical instrument (such as a microscope or telescope) that is closest to the eye and through which the magnified image is viewed.
Usage: Plural form of eyepiece; Technical term used in optics and microscopy

Examples

• The microscope has several interchangeable eyepieces with different magnifications.
• She adjusted the eyepieces on the binoculars to focus the image clearly.
• High-quality eyepieces are essential for viewing distant celestial objects through a telescope.
• The eyepieces of this compound microscope provide 10x magnification.
• Researchers often use multiple eyepieces to achieve different levels of detail in their observations.