Glossary of Eye Definitions and Glasses Terms

Want to discover all things eyewear? Find out more about your eyeglasses and sunglasses, word by word.



Astigmatism refers to an abnormality in the curvature of the cornea of the eye or the shape of the eye’s lens, causing imperfect vision. Eye astigmatism is fairly common, though may go unnoticed if the astigmatism vision is not pronounced enough to require treatment. Astigmatism treatments can include wearing corrective lenses or, in more severe types of astigmatism, in corrective surgery.

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