Astigmatism Meaning and Definition
Astigmatism
Pronunciation
/əˈstɪɡmɪzəm/
Part of Speech
Noun
Definition
A condition in which the eye is irregularly shaped, causing blurry or distorted vision at all distances, often due to the shape of the cornea or lens being different from the ideal shape.
Examples
- The optometrist diagnosed her with astigmatism and prescribed glasses to correct the issue.
- Astigmatism can be treated with corrective lenses, such as glasses or contact lenses.
- After the surgery, he struggled to adjust to the new shape of his eye due to the astigmatism.
- Astigmatism affects approximately one-third of the world’s population.
- Corneal reshaping is a non-surgical procedure used to treat mild astigmatism.
- She decided to get lasik surgery to correct her astigmatism and improve her overall vision.
Etymology
The term “astigmatism” comes from the Greek words “a-” (without) and “stigma” (point or shape), and was first used in the 18th century to describe the irregular shape of the eye.
Usage Notes
Astigmatism is often used as a medical term to describe a specific condition affecting the shape of the eye, but can also be used in a broader sense to describe any irregular shape or form.
Cultural References
Astigmatism has been referenced in popular culture in TV shows and movies, often as a plot point or character trait.
Idiomatic Expressions or Phrases
“In focus” and “out of focus” are idiomatic expressions that can be related to astigmatism, referring to the clarity or bluriness of vision.
Related Words or Phrases
- Refraction
- Cornea
- Lens
Collocations
- Astigmatism correction
- Astigmatism surgery
- Astigmatism treatment
Frequency of Use
Astigmatism is a relatively common medical term, especially in the context of ophthalmology and optometry.
Common Misspellings
- Astimatism
- Astigmatismism