Refractive Depression
The refraction test is an eye exam that measures a person's prescription for eyeglasses or contact lenses.
Alternative Names
Eye test - refraction; Vision test - refraction; Refraction
How the test is performed
This test is performed by an ophthalmologist or optometrist. Both of these professionals are often called "eye doctor."
You sit in a chair that has a special device (called a phoroptor or refractor) attached to it. You look through the device and focus on an eye chart 20 feet away....
Read moreMore information on "Refractive Depression"
From Our Sources
Presbyopia
Source: ADAM Encyclopedia
PreventionThere is no proven prevention for presbyopia.ReferencesDonahue SP. Presbyopia and loss of accommodation. In: Yanoff M, Duker JS, eds.... Read more »
LASIK eye surgery
Source: ADAM Encyclopedia
Laser-Assisted In Situ Keratomileusis; Laser vision correctionReferencesWilkinson PS, Davis EA, Hardten DR. LASIK. In: Yanoff M, Duker JS, eds.... Read more »
Lamellar Keratoplasty
Source: HealthCentral Encyclopedia
Refractive surgery is any operation intended to alter the refractive state of the eye. Refractive corneal surgery refers to operations on the cornea... Read more »
Astigmatism
Source: ADAM Encyclopedia
Astigmatism is a type of refractive error of the eye. Refractive errors cause blurred vision and are the most common reason why a person goes to see... Read more »
Nearsightedness
Source: ADAM Encyclopedia
Nearsightedness is when light entering the eye is focused incorrectly, making distant objects appear blurred. Nearsightedness is a type of refractive... Read more »
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