Can the wavescan measurements of custom LASIK be incorrect?

Question

When I was having my wavescan done the technician said not to stare at the image because it would cause the eye to over focus but rather to look above the image. Will an accurate reading result if you don't look at the image?

Michael K. Tracy, MD · Answer

The wavescan is to most accurate way to measure refractive error but it is not infallible.  That is one of the reasons why your doctor does two refractions before the surgery and records your glasses and contact lens prescriptions.  They should all cluster as check on the wavescan.

Brian Davis, MD · Answer

Certainly wavescan images can be inaccurate. What the technician was wanting you to do was to try not to focus because when you do so it can erroneously alter you measurements due to what is called accommodation. It is common for techs to tell you not to focus because of this issue. I always check the prescription against the wavescan to ensure accuracy.

Can the wavescan measurements of custom LASIK be incorrect?

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Can the wavescan measurements of custom LASIK be incorrect?

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Everything you need to know about LASIK

Our mission is to create a world where every investment in modern beauty is Worth It.