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- Emmetropia abstract "Emmetropia (from Greek emmetros, \"well-proportioned\" or \"fitting\", + -opia) describes the state of vision where a faraway object at infinity is in sharp focus with the eye lens in a neutral or relaxed state. This condition of the normal eye is achieved when the refractive power of the cornea and the axial length of the eye balance out, which focuses rays exactly on the retina, resulting in perfect vision. A human eye in a state of emmetropia requires no corrective lenses; the vision scores well on a visual acuity test (such as an eye chart test). For example, on a Snellen chart test, emmetropic eyes score at \"6/6\"(m) or \"20/20\"(ft) vision, whereas myopic (near-sighted) eyes might score at 20/40 and hyperopic (far-sighted) eyes might score at 20/15.Emmetropia is a state in which the eye is relaxed and focused on an object more than 6 meters or 20 feet away. The light rays coming from that object are essentially parallel, and the rays are focused on the retina without effort. If the gaze shifts to something closer, light rays from the source are too divergent to be focused without effort. In other words, the eye is automatically focused on things in the distance unless a conscious effort is made to focus elsewhere. For a wild animal or human prehistorical ancestors, this arrangement would be adaptive because it allows for alertness to predators or prey at a distance.Accommodation of the lens does not occur in emmetropia. In emmetropia, the lens is about 3.6 mm thick at the center; in accommodation, it thickens to about 4.5 mm. A relatively thin lens and relatively dilated pupil are also associated. The lens usually stiffens with age, causing less ability to focus when the eyes are not in a state of emmetropia.Corrective eye surgery such as LASIK and PRK aims to correct anemmetropic vision. This is accomplished by ensuring the curvature of the cornea, the shape of the lens and their distances from each other and the retina are in harmony. By shaping the cornea, emmetropic vision can be achieved without corrective lenses. The correction for only emmetropic vision is often why patients are still advised to wear glasses to read as they age due to presbyopia.Newborns begin hypermetropic and then undergo a myopic shift to become emmetropic.".
- Emmetropia thumbnail Fig_4_PSWG_1920.gif?width=300.
- Emmetropia wikiPageExternalLink PPA33,M1.
- Emmetropia wikiPageID "9767339".
- Emmetropia wikiPageLength "10062".
- Emmetropia wikiPageOutDegree "32".
- Emmetropia wikiPageRevisionID "706968173".
- Emmetropia wikiPageWikiLink Assimilation_(linguistics).
- Emmetropia wikiPageWikiLink Category:Eye.
- Emmetropia wikiPageWikiLink Category:Visual_system.
- Emmetropia wikiPageWikiLink Cornea.
- Emmetropia wikiPageWikiLink Corrective_lens.
- Emmetropia wikiPageWikiLink Dioptre.
- Emmetropia wikiPageWikiLink Esotropia.
- Emmetropia wikiPageWikiLink Eye.
- Emmetropia wikiPageWikiLink Eye_chart.
- Emmetropia wikiPageWikiLink Focus_(optics).
- Emmetropia wikiPageWikiLink Human_eye.
- Emmetropia wikiPageWikiLink Hyperopia.
- Emmetropia wikiPageWikiLink Infinity.
- Emmetropia wikiPageWikiLink LASIK.
- Emmetropia wikiPageWikiLink Lens_(anatomy).
- Emmetropia wikiPageWikiLink Light.
- Emmetropia wikiPageWikiLink Myopia.
- Emmetropia wikiPageWikiLink Optical_power.
- Emmetropia wikiPageWikiLink Outdoor_recreation.
- Emmetropia wikiPageWikiLink Photorefractive_keratectomy.
- Emmetropia wikiPageWikiLink Presbyopia.
- Emmetropia wikiPageWikiLink Retina.
- Emmetropia wikiPageWikiLink Snellen_chart.
- Emmetropia wikiPageWikiLink Visual_acuity.
- Emmetropia wikiPageWikiLink Visual_perception.
- Emmetropia wikiPageWikiLink Wikt:-opia.
- Emmetropia wikiPageWikiLink File:Fig_4_PSWG_1920.gif.
- Emmetropia wikiPageWikiLinkText "Emmetropia".
- Emmetropia wikiPageWikiLinkText "Emmetropic".
- Emmetropia wikiPageWikiLinkText "emmetropia".
- Emmetropia wikiPageWikiLinkText "emmetropic".
- Emmetropia wikiPageUsesTemplate Template:Citation_needed.
- Emmetropia wikiPageUsesTemplate Template:Convert.
- Emmetropia wikiPageUsesTemplate Template:Refimprove.
- Emmetropia wikiPageUsesTemplate Template:Reflist.
- Emmetropia subject Category:Eye.
- Emmetropia subject Category:Visual_system.
- Emmetropia type Feature.
- Emmetropia comment "Emmetropia (from Greek emmetros, \"well-proportioned\" or \"fitting\", + -opia) describes the state of vision where a faraway object at infinity is in sharp focus with the eye lens in a neutral or relaxed state. This condition of the normal eye is achieved when the refractive power of the cornea and the axial length of the eye balance out, which focuses rays exactly on the retina, resulting in perfect vision.".
- Emmetropia label "Emmetropia".
- Emmetropia sameAs Q1310580.
- Emmetropia sameAs Emmetropie.
- Emmetropia sameAs Emetropía.
- Emmetropia sameAs بسازبینی.
- Emmetropia sameAs Emmétropie.
- Emmetropia sameAs Նորմալատեսություն.
- Emmetropia sameAs Emmetropia.
- Emmetropia sameAs Emetropia.
- Emmetropia sameAs Emmetropie.
- Emmetropia sameAs Emetropia.
- Emmetropia sameAs Emetropia.
- Emmetropia sameAs m.02prkxg.
- Emmetropia sameAs Эмметропия.
- Emmetropia sameAs Emmetropi.
- Emmetropia sameAs Q1310580.
- Emmetropia wasDerivedFrom Emmetropia?oldid=706968173.
- Emmetropia depiction Fig_4_PSWG_1920.gif.
- Emmetropia isPrimaryTopicOf Emmetropia.