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Astigmatism (eye): Refractive error, Eye, Refraction, Retina, Contact lens, Cylindrical lens, Refractive surgery, Cornea, Lens (anatomy) - Softcover

 
9786133736276: Astigmatism (eye): Refractive error, Eye, Refraction, Retina, Contact lens, Cylindrical lens, Refractive surgery, Cornea, Lens (anatomy)
Softcover
ISBN 10: 6133736275 ISBN 13: 9786133736276
Verlag: OmniScriptum, 2010

Inhaltsangabe

Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Astigmatism is an optical defect in which vision is blurred due to the inability of the optics of the eye to focus a point object into a sharp focused image on the retina. This may be due to an irregular or toric curvature of the cornea or lens. There are two types of astigmatism: regular and irregular. Irregular astigmatism is often caused by a corneal scar or scattering in the crystalline lens and cannot be corrected by standard spectacle lenses, but can be corrected by contact lenses. Regular astigmatism arising from either the cornea or crystalline lens can be corrected by a toric lens. A toric surface resembles a section of the surface of an American football or a doughnut where there are two regular radii, one smaller than another. This optical shape gives rise to regular astigmatism in the eye. The first spectacle lenses that corrected astigmatism were made in Philadelphia in 1841.

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Reseña del editor

Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Astigmatism is an optical defect in which vision is blurred due to the inability of the optics of the eye to focus a point object into a sharp focused image on the retina. This may be due to an irregular or toric curvature of the cornea or lens. There are two types of astigmatism: regular and irregular. Irregular astigmatism is often caused by a corneal scar or scattering in the crystalline lens and cannot be corrected by standard spectacle lenses, but can be corrected by contact lenses. Regular astigmatism arising from either the cornea or crystalline lens can be corrected by a toric lens. A toric surface resembles a section of the surface of an American football or a doughnut where there are two regular radii, one smaller than another. This optical shape gives rise to regular astigmatism in the eye. The first spectacle lenses that corrected astigmatism were made in Philadelphia in 1841.

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Verlag
OmniScriptum
Erscheinungsdatum
2010
Sprache
Englisch
ISBN 10 
6133736275
ISBN 13 
9786133736276
Einband
Tapa blanda
Anzahl der Seiten
80
Herausgeber
Miller Frederic P., Vandome Agnes F., McBrewster John
Kontakt zum Hersteller
Nicht verfügbar
Verantwortliche Person
Nicht verfügbar

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