Refractive Errors

An eye that has no refractive error when viewing a distant object is said to have emmetropia or be emmetropic. An eye that has a refractive error when viewing a distant object is said to have ametropia or be ametropic.

Refractive errors are frequently categorized as spherical errors and cylindrical errors

Blurry vision may result from any number of conditions not necessarily related to refractive errors. The diagnosis of a refractive error is usually confirmed by an eye care professional during an eye examination