A lens or optical system that has astigmatism, or a person who has astigmatic vision.
From Greek 'a-' (without) plus 'stigma' (point, focus). Used in optics to describe lenses that cannot focus light to a single point due to curved surfaces.
Astigmatism is like your eye's fingerprint being smudged—light hits at different angles and can't quite come together at one spot, which is why so many people need glasses that correct this specific optical imperfection.
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