Difference between revisions of Emmetropia

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 {{For|corrective lenses used to get someone to 20/20 vision|20/20 correction}}
-'''Emmetropia''' is the state in which an eye is neither [[nearsighted]] nor [[farsighted]] nor [[astigmatism|astigmatic]]. An eye is said to be emmetropic when the image of an object at infinity (parallel light rays) forms on the [[retina]], rather than in front of or behind it, resulting in zero [[refractive state]] and implying it is also free of [[astigmatism]]. This causes the [[natural focal plane]] to be [[full correction]].
+'''Emmetropia''' is the zero [[refractive state]] in which an eye is neither [[nearsighted]] nor [[farsighted]] nor [[astigmatism|astigmatic]]. This causes the [[natural focal plane]] to be [[full correction]]. An eye is said to be emmetropic when the image of an object at infinity (parallel light rays) forms on the [[retina]], rather than in front of or behind it, implying it is also free of [[astigmatism]].
 Babies are born [[farsighted]], and become emmetropic over time after birth through [[axial elongation]] during emmetropization.