Difference between revisions of Emmetropia
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==Thresholds== | ==Thresholds== | ||
Eyes are generally regarded as emmetropic if their spherical equivalent is between -0.5 and +0.5 D and can achieve 20/20 distance [[visual acuity]] without lenses. This permits some [[myopia]], [[hyperopia]], and [[astigmatism]]. | Eyes are generally regarded as emmetropic if their spherical equivalent is between -0.5 and +0.5 D and can achieve 20/20 distance [[visual acuity]] without lenses. | ||
This permits some [[myopia]], [[hyperopia]], and [[astigmatism]]. However, a truly emmetropic eye would typically achieve 20/8 acuity (no myopia or astigmatism) and be blurred to 20/20 through a +0.25 lens (no hyperopia). | |||
==References== | ==References== | ||