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Can Axis measurement change?

My prescription has changed especially the Axis number.  Isn't that the spot of your astigmatism?  Can it change? Seems like every year someone else does the testing but there is quite a difference in 56 and 175.  Should I ask for a "re-do"?
2012:
OD: Sphere -.25        Cyl 0.25    AXIS 175
OS   Sphere -.50       CYL -1.00  AXIS 180

2013:
OD: Sphere PL         CYL 0     AXIS 0
OS: Sphere -.50        CYL +1.25  AXIS 0

2014
OD: Sphere: PL        CYL +.25  AXIS 056
OS: Sphere -0.75      CYL +1.00  AXIS 005
2 Responses
1731421 tn?1358823371
MEDICAL PROFESSIONAL
Hi,
Axis can change, but your astigmatixm isn't going to amount to much.
Tim
1731421 tn?1358823371
MEDICAL PROFESSIONAL
The amount of astigmatism (Cyl) at axis 56 (+0.25D) and 175 (+0.25D) is fairly negligible as is the lack of astigmatism is 2013 for the OD (right eye).
OS is a different story: you went from -1.00D to +1.00D which amount to a 2D magnitude difference...that's huge; the axis didn't change much, but the magnitude did. I would go in and get this checked for an error.

Best wishes,
Timothy D. McGarity, Medical Doctor, Ophthalmologist

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