1. the eyepieces of optical instruments such as microscopes, telescopes, or binoculars
Usage: technical; optics

Examples

• The microscope came with three different oculars for various magnifications.
• She cleaned the oculars of her telescope before the astronomy session.
• The binoculars’ oculars were adjustable for different eye distances.
• High-quality oculars can significantly improve image clarity.
• The lab technician replaced the damaged oculars on the research microscope.