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Refraction test

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Normal vision
Normal vision
Alternative Names

Eye test - refraction; Vision test - refraction


Normal Values

A normal value is 20/20 vision (perfect vision - able to read 3/8 inch letters at 20 feet). A small type size is also used to determine normal near vision.


What abnormal results mean
  • Myopia (nearsightedness)
  • Hyperopia (farsightedness)
  • Astigmatism (asymmetrical cornea)
  • Presbyopia (inability to focus on near objects that develops with age)

Review Date: 02/22/2007
Reviewed By: Manju Subramanian, MD, Assistant Professor in Ophthalmology, Vitreoretinal Disease and Surgery, Boston University Eye Associates, Boston, MA. Review provided by VeriMed Healthcare Network.

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