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During an initial eye exam, a potential laser eye surgery patient has their eyes measured through a process called refractive stability. The day of the laser eye surgery, an eye exam is performed again and the results are the compared with the initial eye exam measurements. It is important that the measurements of the patient's exams are accurate and show consistency between them.
This is why laser eye surgeons prefer to only perform the surgery on patients that have had a stable prescription for one year. To many laser eye patients, the risk of having the eye surgery and gaining improved vision outweighs their concerns that their refractive stability is not stable. This is a gray area that you must discuss with your eye surgeon.