astigmatism: meaning, definition, pronunciation and examples
C1Formal, Technical
Quick answer
What does “astigmatism” mean?
A common visual defect where the eye's lens or cornea is irregularly shaped, causing blurred or distorted vision because light rays are not focused to a single point on the retina.
Audio
Pronunciation
Definition
Meaning and Definition
A common visual defect where the eye's lens or cornea is irregularly shaped, causing blurred or distorted vision because light rays are not focused to a single point on the retina.
Figuratively, a lack of clear perception, discernment, or understanding in a non-physical context; a distorted view or focus.
Dialectal Variation
British vs American Usage
Differences
No significant lexical differences. Pronunciation differs slightly (see IPA). Spelling is identical.
Connotations
Identical medical connotations. Figurative use is equally rare in both varieties.
Frequency
Similar frequency in both, tied to medical/optical contexts. Not a high-frequency everyday word.
Grammar
How to Use “astigmatism” in a Sentence
[Subject] has astigmatism.Astigmatism is corrected with [corrective lens/surgery].The optician diagnosed [someone] with astigmatism.Vocabulary
Collocations
Examples
Examples of “astigmatism” in a Sentence
verb
British English
- Astigmatism cannot be 'verbed'. The related verb is 'to astigmatize', but it is extraordinarily rare and not in standard use.
American English
- Astigmatism cannot be 'verbed'. The related verb is 'to astigmatize', but it is extraordinarily rare and not in standard use.
adverb
British English
- The light was focused astigmatically.
- Rarely used.
American English
- The lens bends light astigmatically.
- Rarely used.
adjective
British English
- The astigmatic patient needed toric lenses.
- An astigmatic corneal surface scatters light.
American English
- The patient's astigmatic cornea required a special prescription.
- He had an astigmatic error in both eyes.
Usage
Meaning in Context
Business
Virtually unused, except perhaps in the optical/healthcare industry.
Academic
Used in medical, biological, and optical physics texts.
Everyday
Used when discussing eye tests, glasses, or contact lens prescriptions.
Technical
Core term in optometry and ophthalmology, with specific classifications (e.g., regular vs. irregular astigmatism).
Vocabulary
Synonyms of “astigmatism”
Strong
Neutral
Weak
Vocabulary
Antonyms of “astigmatism”
Watch out
Common Mistakes When Using “astigmatism”
- Misspelling as 'astigmatizm' or 'astigmatisim'.
- Using it as a synonym for general poor eyesight (e.g., myopia/nearsightedness).
FAQ
Frequently Asked Questions
No. Astigmatism is a different type of refractive error caused by an irregularly shaped cornea or lens, leading to blurred vision at all distances. It can occur alone or alongside short-sightedness (myopia) or long-sightedness (hyperopia).
It cannot be 'cured' in the sense of being permanently eradicated from the eye's structure, but it is almost always fully correctable with prescription glasses, contact lenses (often toric lenses), or refractive surgery like LASIK.
It can change, typically stabilizing in adulthood. However, certain conditions like keratoconus can cause it to worsen. Regular eye exams are recommended to monitor any changes.
Figuratively, it describes a distorted or unclear perspective, an inability to see or understand a situation accurately. For example: 'The policy was flawed due to a political astigmatism regarding economic realities.'
A common visual defect where the eye's lens or cornea is irregularly shaped, causing blurred or distorted vision because light rays are not focused to a single point on the retina.
Astigmatism is usually formal, technical in register.
Astigmatism: in British English it is pronounced /əˈstɪɡmətɪz(ə)m/, and in American English it is pronounced /əˈstɪɡməˌtɪzəm/. Tap the audio buttons above to hear it.
Phrases
Idioms & Phrases
- “A mental astigmatism (figurative, rare)”
Learning
Memory Aids
Mnemonic
Think: 'A STIGMA in the eye' – an irregularity (stigma) that distorts the image.
Conceptual Metaphor
CLARITY IS SHARPNESS OF FOCUS / A DISTORTED VIEW IS A BLURRY LENS
Practice
Quiz
What is the primary cause of astigmatism?