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Nearsightedness: Hyperopic Shift After Surgery - Topic Overview

Most people who have radial keratotomy (RK) surgery gradually become more farsighted for at least 8 to 10 years after surgery. This is called the hyperopic shift. It is not clear what causes the shift. It's also not clear how long it may last or how bad it will get.

The effects depend on the person's age and whether the person is nearsighted or farsighted after the surgery.

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  • People who are still slightly nearsighted after surgery (undercorrected) may find that their distance vision slowly improves as the hyperopic shift occurs.
  • People younger than 40 may not notice the shift. That's because their eyes can adjust to the change.
  • People around age 40 may get presbyopia sooner as a result of the hyperopic shift. They may need reading glasses.

    This information is produced and provided by the National Cancer Institute (NCI). The information in this topic may have changed since it was written. For the most current information, contact the National Cancer Institute via the Internet web site at http:// cancer .gov or call 1-800-4-CANCER.

    WebMD Medical Reference from Healthwise

    Last Updated: September 09, 2014
    This information is not intended to replace the advice of a doctor. Healthwise disclaims any liability for the decisions you make based on this information.
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