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What the Test Can Do—and What It Can’t
The test checks your information against the thresholds set by the Commission on Refractive Surgery. It thus answers the question of whether your diopter values generally fall within the applicable range. There are four things it cannot measure—and these are precisely the factors that play a decisive role:
✓Thetest takes into account
- your age and the stability of your vision
- nearsightedness or farsightedness
- Astigmatism
- the KRC rule, which states that nearsightedness and astigmatism are added together
- known eye conditions as exclusion criteria
✕Measurableonlyduring the examination
- Corneal thickness—determines which procedure is possible
- Corneal topography—detects early changes in shape
- Pupil size – affects vision in low light
- Tear film – determines how well the healing process proceeds
That’s why even a “Looks good” isn’t a guarantee. It means: Your results don’t rule out the procedure, so an exam is worth doing. If the measurements show something else, we’ll let you know—and we won’t charge you for the procedure.