The state of refraction of the eye in which parallel rays, when the eye is at rest, are focused exactly on the retina. [G. emmetros, according to measure, + ops, eye]
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em·me·tro·pia .em-ə-'trō-pē-ə n the normal refractive condition of the eye in which with accommodation relaxed parallel rays of light are all brought accurately to a focus upon the retina compare ASTIGMATISM, MYOPIA
em·me·trop·ic -'träp-ik, -'trōp- adj
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n.
the state of refraction of the normal eye, in which parallel light rays are brought to a focus on the retina with the accommodation relaxed. Distant objects are seen clearly without any effort to focus. Compare ametropia, hypermetropia, myopia.
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em·me·tro·pia (em″ə-troґpe-ə) [Gr. emmetros in proper measure + -opia] a state of proper correlation between the refractive system of the eye and the axial length of the eyeball, rays of light entering the eye parallel to the optic axis being brought to a focus exactly on the retina. emmetropic adj
Emmetropia.
Medical dictionary. 2011.