Phys. [mod.L. (invented by F. C. Donders of Utrecht), f. Gr. ἔμμετρ-ος in measure + ὠπ- stem of ὤψ the eye + -IA.] ‘The normal or healthy condition of the refractive media of the eye, in which parallel rays are brought to a focus upon the retina when the eye is at rest and in a passive condition’ (Syd. Soc. Lex.).
1864. W. D. Moore, trans. Donders’ Accommod. & Refr. Eye, 81.
1878. T. Bryant, Pract. Surg., I. 299. The former condition is known as emmetropia.
