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5 Ways To Know If You're a Good LASIK Candidate

Saturday, April 30 2016 8:44 PM

Before you can have refractive surgery - the surgical procedures that correct common issues like astigmatism, nearsightedness, and farsightedness - you must qualify. We use a series of five tests for this.

In an effort to take some of the anxiety and mystery away from this process, here’s  what you can expect from each test.

  • Non-Contact Tonometry

This machine delivers a puff of air to temporarily flatten your cornea. This allows us to measure the intraocular pressure (or fluid pressure) inside your eye, which helps us evaluate one of the risk factors for glaucoma.

  • Manual Keratometry

This test measures the curvature of the central two millimeters of the cornea (the front window of the eye) by reflecting an image off of it. This procedure allows us to measure the power/curvature of your cornea. Manual keratometry also provides us with feedback about the quality of your tears and how smooth the front surface of the cornea is, helping us detect irregular astigmatism or dry eyes.   

  • Auto Refractor / Keratometer

This machine measures how light is focused when it goes into and back out of your eye. These measurements help us estimate your prescription, providing us with a starting point for determining what needs to be corrected during refractive surgery. Most people will recognize this as the machine with a picture of a hot air balloon or farmhouse in it.

  • Pentacam

Using a rotating beam and camera, the pentacam measures the curvature, thickness, and elevation of the front and back surface of the cornea. This tells us if the cornea has enough thickness and the right curvature to support the laser treatment. It can also help us identify any corneal disease that might be occurring.These measurements are vital in determining if refractive surgery is a good option for you.

  • Ladarwave and OPD-III

No, these are not Star Wars characters. They are the two machines we use to perform a wavefront analysis - a measurement of how light is focused through your eyes.

The OPD-III and Ladarwave both look at light distortions as light travels through your eye (much like the autorefraction test from earlier). These methods provide us with additional measurements that we use to evaluate your candidacy for surgery and to determine the best treatment for your eyes.

Our laser is a wavefront optimized laser, meaning it corrects for vision aberrations that fall into the normal range most people have. If your eyes have aberrations outside the normal range, a LASIK procedure would not be recommended (not because of the aberrations, but because our machine is unable to correct for them).

And there you have it.. the five tests you’ll experience when you book your LASIK consultation at Grene Laser. We know what you might be thinking at this point: “Do I have to pass them all?”

The truth is that there is no passing or failing. We simply use these tests to gather as much information about your eyes as possible before we’re able to make recommendations. Our doctors and technicians are extremely knowledgeable and talented. They will be happy to answer any questions you might have.

Kristen Lingg
"Even with contacts correcting my poor vision I still had problems with halos around runway lights at night. Immediately after surgery I could see better than I ever had. My vision is better than perfect and halo free."
Kristen Lingg, Pilot - Wichita, KS

Read what our patients say