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Monday, February 25, 2013

Refractive errors: These are disorders of the eye, not diseases.

Emmetropia: A normal eye with no refractive errors is an emmetropic eye. Emmetropia means when parallel rays of light from infinity distance falls on the eye, it can focus them on the retina without any accommodation  Infinity distance in Ophthalmology is defined to be a distance of 6 m or more.
Emmetropia / Normal Vision
Emmetropia / Normal Vision

Ametropia: An eye with refractive errors when viewing objects at infinity distance is an ametropic eye. This eye has to accommodate the parallel rays of light to focus them on the retina.
Refractive Errors of the Eye
Refractive Errors of the Eye