1. a type of lens or optical system designed to correct spherical aberration and coma, used in telescopes and microscopes
Usage: technical; optics

1. of or relating to an optical system that is corrected for spherical aberration and coma
Usage: technical; optics

Examples

• The aplanat design improved the clarity of the telescope's image.
• Early microscope manufacturers adopted aplanat objectives to reduce optical distortion.
• An aplanat lens system minimizes both spherical aberration and coma.
• The aplanat configuration was a significant advancement in optical engineering.