Multifocal Implants Are Wrong Correction?

I would like to know how it is possible for the multifocal IOLs that I got 6 weeks ago to be the wrong correction. I was measured by a computer. Is it operator error? I have been told (via second opinion) that I can have a LASIK correction but it is a small amount, -.50 compared to -6.50 prior to surgery, and that I run the risk of over correction and I would be worse off than I am now. Currently I am over corrected for near and under corrected for distance.

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