Emmetropia
When parallel ray of light coming from infinity and focus no the retina when accommodation at rest is called as emmetropic .
Ametropia or it is also called as refractive error, when parallel rays of light not focused on the retina it's either in front, behind such condition called as ametopia.
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When parallel ray of light coming from infinity and focus in front of retina when accommodation at rest is called as myopia.
When parallel ray of light coming from infinity and focus in behind the retina when accommodation at rest is called as hypermetropia .
When parralel ray of light coming from infinity and focus in line not in point is called as astigmatism.
Myopia
When parallel ray of light coming from infinity and focus in front of retina when accommodation at rest is called as myopia.
Hypermetropia
When parallel ray of light coming from infinity and focus in behind the retina when accommodation at rest is called as hypermetropia .
Astigmatism
When parralel ray of light coming from infinity and focus in line not in point is called as astigmatism.
Presbyopia
It is condition of refractive error in which patient unable to read near letters it's due to the loss of accommodation , it's starting from the age of 40 years.
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