astigmatism

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Key facts

Medical condition (new).name: Astigmatism
Medical condition (new).image: astigmatism text blur.png
Medical condition (new).caption: Blur from astigmatic lens at different distances
Medical condition (new).field: Ophthalmology, optometry
Medical condition (new).symptoms: Distorted or blurred vision at all distances, eyestrain, and headaches
Medical condition (new).complications: Amblyopia
Medical condition (new).causes: Unclear
Medical condition (new).diagnosis: Eye exam
Medical condition (new).treatment: Glasses, contact lenses, surgery
Medical condition (new).frequency: 30% to 60% of adults (Eurasia)

via Wikipedia infobox

Research

17,032 papers

Beginnings of Astigmatism Understanding and Management in the 19th Century.ReviewEye & contact lens · 2018Grzybowski A, Kanclerz PDOI: 10.1097/ICL.0000000000000449
Management of postkeratoplasty astigmatism.ReviewCurrent opinion in ophthalmology · 1998Riddle HK Jr, Parker DA, Price FW JrDOI: 10.1097/00055735-199808000-00004
Treating astigmatism at the time of cataract surgery.ReviewCurrent opinion in ophthalmology · 2002Gills JPDOI: 10.1097/00055735-200202000-00002
[Astigmatism correction with Excimer laser].ReviewJournal francais d'ophtalmologie · 2012Gauthier LDOI: 10.1016/j.jfo.2011.12.001
The visual and functional impacts of astigmatism and its clinical management.ReviewOphthalmic & physiological optics : the journal of the British College of Ophthalmic Opticians (Optometrists) · 2014Read SA, Vincent SJ, Collins MJDOI: 10.1111/opo.12128
Magnitude of astigmatism - A comparison between eyes.Contact lens & anterior eye : the journal of the British Contact Lens Association · 2022Luensmann D, Schaeffer JL, Rumney NJ et al.DOI: 10.1016/j.clae.2021.101510
Distribution of astigmatism in the adult population.ReviewJournal of the Optical Society of America. A, Optics, image science, and vision · 1996McKendrick AM, Brennan NADOI: 10.1364/josaa.13.000206
Astigmatism Influences Quantitative and Qualitative Analysis in Optical Coherence Tomography Angiography Imaging.Translational vision science & technology · 2024Vidal-Oliver L, Gallego-Pinazo R, Dolz-Marco RDOI: 10.1167/tvst.13.1.10

via PubMed

Wikidata facts

Image: Astigmatism.jpg

Show 4 more facts

Commons category: Astigmatism (eye)
ICPC 2 ID: F91
exact match: purl.obolibrary.org/obo/HP_0000483
ICD-9-CM: 367.2

Sources (9)

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~17 min read

Article

16 sections

Contents

Signs and symptoms
Causes
Congenital
Acquired
Pathophysiology
Axes of the principal meridians
Focus of the principal meridian
Throughout the eye
Diagnosis
Classification
Treatment
Epidemiology
History
See also
References
External links

Astigmatism is a type of refractive error due to rotational asymmetry in the eye's refractive power. The lens and cornea of an eye without astigmatism are nearly spherical, with only a single radius of curvature, and any refractive errors present can be corrected with simple glasses. In an eye with astigmatism, either the lens or the cornea is slightly egg-shaped, with higher curvature in one direction than the other. This gives distorted or blurred vision at any distance and requires corrective lenses that apply different optical powers at different rotational angles. Astigmatism can lead to symptoms that include eyestrain, headaches, and trouble driving at night. Astigmatism often is present at birth, but can change or develop later in life. If it occurs in early life and is left untreated, it may result in amblyopia.

The cause of astigmatism is unclear, although it is believed to be partly related to genetic factors. The underlying mechanism involves an irregular curvature of the cornea and protective reaction changes in the lens of the eye, called lens astigmatism, that has the same mechanism as spasm of accommodation. Diagnosis is by an eye examination called autorefractor keratometry (objective, allows to see lens and cornea components of astigmatism) and subjective refraction.