Myopia
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Myopia, also called nearsightedness or shortsightedness, is a refractive defect of the eye in which collimated light produces image focus in front of the retina when accommodation is relaxed. Those with myopia see nearby objects clearly but distant objects appear blurred. With myopia, the eyeball is too long, or the cornea is too steep, so images are focused in the vitreous inside the eye rather than on the retina at the back of the eye. The opposite defect of myopia is hyperopia or "farsightedness" or "long-sightedness" this is where the cornea is too flat or the eye is too short. Mainstream eye care professionals most commonly correct myopia through the use of corrective lenses, such as glasses or contact lenses. It may also be corrected by refractive surgery, such as LASIK. The corrective lenses have a negative optical power (i.e. are concave) which compensates for the excessive positive diopters of the myopic eye.
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GarantieWeitere Informationen
- Allgemeine Informationen
- Sprache Englisch
- Editor Frederic P. Miller, Agnes F. Vandome, John McBrewster
- Titel Myopia
- ISBN 978-613-0-23817-9
- Format Fachbuch
- EAN 9786130238179
- Jahr 2009
- Größe H220mm x B150mm x T9mm
- Untertitel Refractive error, Focus (optics), Collimated light, Retina, Accommodation (eye), Visual perception, Cornea, Hyperopia, Eye care professional, Corrective lens, Glasses
- Gewicht 231g
- Genre Medizin
- Anzahl Seiten 144
- Herausgeber Alphascript Publishing
- GTIN 09786130238179
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