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 Refraction

Please note that "refraction test" refers to the test the dr performs to test what strength eyeglasses lens you need.  Refractions are not covered by Medicare, although most eyetests themselves are since the eye exam is for the medical condition of the eyes, and refraction is for the eyeglasses.

 

Refraction defined.... submitted by Rita L/SD:

         http://www.merck.com/mmhe/sec20/ch225/ch225c.html

 

Information regarding the refraction prescripton the dr writes out:

O.D.or Occular Dexter is the right eye


O.S. or Occular Sinister is the left eye


Sphere-a round or spherical shaped eye


Cylinder-When you have an astigmatic eye,or an eye in which vertical and horizontal lines focus at different points.


Axis-the number of degrees from 0 to 180 that the cylinder is ground into a lens to correct for astigmatism.


O.D.-O.50 -0.25 x 001 

     means Right Eye  -.50 sphere  -.25 cylinder x(at axis)001 (1 degree)


O.S.-0.50 -0.50 x 180

    means Left Eye -.50 sphere  -.50 cylinder x(at axis)180 (180 degrees)


If the axis was 0 then there would be no astigmatic correction and the prescrption  would be in this case,-0.50 sphere O.U.( occular unisom) or both eyes.



 


 



 

 

 

 

 

 


 

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