Astigmatism Meaning: Definition, Examples, and Translations

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astigmatism

[รฆstษ™ษกหˆmรฆtษชzษ™m ]

Definition

Context #1 | Noun

eye condition

Astigmatism is a common vision condition caused by an irregular shape of the cornea or lens in the eye. This shape prevents light from focusing properly on the retina, leading to blurred or distorted vision. It can occur in combination with other vision problems such as nearsightedness or farsightedness. People with astigmatism may experience difficulties with contrast and may notice headaches or eye strain. Regular eye examinations can help diagnose and manage astigmatism effectively.

Synonyms

blurred vision, distorted vision.

Examples of usage

  • She has astigmatism and needs glasses to see clearly.
  • Astigmatism can often be corrected with prescription lenses.
  • Many people are unaware they have astigmatism until they get an eye exam.

Translations

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Origin of 'astigmatism'

The term 'astigmatism' originates from the Greek words 'a-' meaning 'without', and 'stigma' meaning 'a point' or 'mark'. It was first used in the 17th century to describe a condition where light rays converge at different points, leading to distorted or blurred images. The concept of astigmatism became more widely known in the early 19th century through advancements in optics and understanding of the eye's anatomy. As medical knowledge progressed, the understanding and classification of different types of astigmatism evolved, leading to improved diagnostic techniques and corrective measures. Today, astigmatism is recognized as a prevalent refractive error in vision that can be easily diagnosed and treated.


Word Frequency Rank

Positioned at #24,318, this word is part of extensive vocabulary. It's relatively rare in general usage but may be important in specific fields or formal writing.