Difference between revisions of Emmetropia
No edit summary |
|||
| Line 1: | Line 1: | ||
{{For|corrective lenses used to get someone to 20/20 vision|20/20 correction}} | {{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, implying it is free of [[astigmatism]]. | '''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]]. | ||
Babies are born [[farsighted]], and become emmetropic over time after birth through [[axial elongation]] during emmetropization. | Babies are born [[farsighted]], and become emmetropic over time after birth through [[axial elongation]] during emmetropization. | ||