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Five Tests We Use To Determine If You’re a Good Candidate for LASIK

Wednesday, March 3 2021 5:32 PM
Five Tests We Use LASIK

Before you can have the LASIK procedure to correct common vision issues like astigmatism, nearsightedness, and farsightedness, you must qualify. 

We use five tests to determine if you’re a good candidate for LASIK. Relax — there’s no studying required. 

To take some of the anxiety and mystery away from this process, here’s what you can expect from each test during your consultation.

Non-contact Tonometry

This machine delivers a puff of air that temporarily flattens your cornea. This lets us measure the fluid pressure (also called, “intraocular pressure”) inside your eye. 

Knowing the levels of this pressure helps us evaluate one of the risk factors for glaucoma. High levels could invalidate your LASIK candidacy. 

Manual Keratometry

This test reflects an image off of the central three millimeters of your cornea (think of your cornea like the front window of your eye). This lets us measure the power/curvature of your cornea. 

Manual keratometry also provides feedback about the quality of your tears and how smooth the front surface of your cornea is. This helps us detect irregular astigmatism or dry eyes, both of which could complicate your LASIK procedure. 


Beginning with the autorefractor, this machine measures how light is focused when it goes into and back out of your eye. (If you’ve visited us before, you might recognize this as the machine with a picture of a hot air balloon or farmhouse in it.)

This measurement gives us a starting point for your prescription. We then refine that measurement by performing a detailed manifest refraction so we know what needs to be corrected during your LASIK surgery. 


A pentacam measures the curvature, thickness, and elevation of the front and back surfaces of your cornea by using a rotating beam and camera.  

This measurement tells us if your cornea is thick enough and has the right curvature to support the laser treatment. It can also help us identify any corneal disease that might be occurring. 

This measurement is vital in determining if refractive surgery is a good option for you. A poor measurement, here, would definitely disqualify you from having LASIK.


This machine performs a Wavefront analysis — a measurement of how light is focused through your eyes. The machine looks at light distortions as light travels through your eye (much like the autorefraction test from earlier). 

This additional measurement helps us determine the best treatment for your eyes and is used to evaluate your candidacy for LASIK.

Passing the tests

At this point, you might be wondering: “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. The results of these tests let your doctor know if your vision is correctable using our LASIK technology.

Our doctors and technicians are extremely knowledgeable and talented. They will be happy to answer any questions you might have. Contact us today to book your free consultation to find out if LASIK is the right solution for your vision.

Contact us today to schedule your appointment and discover if LASIK is right for you.

Shalee Lehning
"Playing sports is hard enough without worrying about your contacts. The inconvenience of losing contacts during practice and competition was frustrating for me. The decision to have the surgery was the best decision I have made!"
Shalee Lehning, K-State Women's Assistant Coach / Former WNBA and K-State Player - Manhattan, KS

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