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LASIK Raleigh, NC, PRK, laser vision surgery, Lowry Porter Ophthalmology - A State of Sight #20

LASIK and PRK are the most common laser vision correction procedures. Isaac Porter, MD explains what to expect in an evaluation for LASIK. Patients will have their medical history reviewed, their vision checked, and have specialized testing procedures. These tests include corneal topography (mapping the surface curvature of the eye), wavefront analysis (measuring how light passes in and out of the eye), and ultrasound measurement of corneal thickness. Along with an eye exam, this full evaluation will help determine candidacy for LASIK.




Welcome to A State of Sight. I’m Isaac Porter, MD from Porter Ophthalmology. This is a special episode for our patients that may be considering laser vision correction.

If you’ve scheduled to see us for a free evaluation, first we will check your medical history and your eye history to see if you have any problems in the past other than glasses or contact lenses.

Next, we will check the vision of both eyes to determine how you are currently seeing with your glasses or contact lenses. Then, we will perform two special tests with one of our technicians, corneal topography and a wavescan.

Corneal topography takes a map of the cornea, which is the clear shield that covers the front of the eye. The cornea is the part of the eye where we change the shape with laser eye surgery to include the power needed for vision correction onto the eye. This test shows the curvature and the shape of the cornea which we need to know to help determine if you may qualify for surgery.

The wavescan measures a wavefront image that shows how light passes into and out from the eye. This is unique to each person, a little bit like a fingerprint, and gives us an idea of the prescription that you will need to get the best vision possible.

Afterwards, I will perform an eye exam to check the health of the eye. If you have a corneal problem or cataracts, you may not qualify for LASIK. During this visit, we generally do not need to dilate your eyes and view the retina. However, if you do qualify for surgery we will dilate the eyes before the operation at the preop visit.

Following the eye exam, I will use an ultrasound instrument (a pachymeter) to measure the thickness of the cornea (pachymetry). If the cornea is too thin, laser vision correction may not be an option, or you may only qualify for PRK and not LASIK.

These two procedures, LASIK and PRK, are the two forms of laser vision correction that I perform. Most patients may choose either procedure, but others may not have a choice and can only have one or the other.

If you have a choice, we can talk about the differences between the operations to help you make the best decision. Also, if you look back at episode #6 of A State of Sight, I go into more detail comparing LASIK and PRK.

After all of these tests and measurements, I can determine if you are a candidate to qualify for eye surgery. Then you may schedule a pre-op visit where we make the final plan, and the procedure can be performed as soon as the next day after.

We hope to see you soon when you come in for your free LASIK evaluation. If you have any questions remember, don’t hesitate to ask. Thanks again for joining us on A State of Sight.