Definitions

1. noun

a vision problem caused by an irregular shape of the cornea or lens, resulting in distorted or blurred vision.

“The eye doctor diagnosed the patient with astigmatism and prescribed corrective lenses.”

2. noun

a type of aberration in a lens or mirror system, resulting in a failure to focus light rays to a single point.

“The astigmatism in the telescope’s lens prevented us from observing the distant stars clearly.”