Also found in: Dictionary, Thesaurus, Medical, Wikipedia.
Related to Emmetropia: ametropia


Normal vision.



normal, or correct, refraction of the eye, as opposed to incorrect refraction, or ametropia, in which the optical system is unable to bring into focus on the retina the parallel light rays entering the eye.

Mentioned in ?
References in periodicals archive ?
For patients who have enjoyed relatively good vision with near emmetropia all of their life, experiencing the vision change of presbyopia comes as a surprise.
On returning to distance vision, relaxation of the ciliary muscle allows the two lenses to come together again returning to emmetropia.
If the patient is self-funding, they could opt to have a clear lens exchange (CLE) on the other eye with emmetropia being the ultimate goal, but as this is not an option for NHS patients, the implant is calculated to reduce the risk of anisometropic problems.