How to Know If You Qualify for Lasik Surgery

By Chris P. Tan  |   Submitted On December 27, 2013  
  
Lasik (laser assisted in situ keratomileusis) surgery is a procedure that can help many individuals who have nearsightedness, farsightedness or astigmatism regain back their lost vision. Before the surgery can take place, potential candidates need to undergo various tests to determine lasik surgery compatibility. These tests are not only painless but necessary as approximately 30% of people are not good candidates for lasik surgery.

Individuals who are scheduled for lasik surgery compatibility tests are asked to refrain from wearing their soft contacts for 48 hours or their hard contacts for one week before testing as contacts can alter the shape of the cornea, possibly affecting test results. The testing also involves dilating the pupils, so patients should arrange for transportation following the examination.

Tomography of the cornea
Tomography of the cornea, also known as optical coherence tomography (OCT), allows the ophthalmologist to thoroughly evaluate the anatomy of the cornea. The term "tomography" refers to the ability of the test to provide the clinician with sectional images of the cornea. This test is completely noninvasive, which means no contact is made with the eye. Instead, images of the cornea are produced using reflected light (near infrared light) from the eye's tissues.

Within just a few seconds, the ophthalmologist can get accurate three-dimensional images of the cornea that help determine whether the patient is a candidate for lasik surgery. Among the measurements taken is the coefficient of variation, which can reveal how much cell loss has occurred in the cornea. This information is critical for surgeons from which to base their decision.

Visual acuity and refraction examination
These quick tests are common during an optometry examination. A visual acuity test involves reading letters on a chart (Snellen chart) that is 20 feet away while covering one eye first before the other.

The refraction examination goes hand in hand with the visual acuity test. Also known as a vision test, the refraction test tells the doctor what prescription individuals need to achieve 20/20 vision. To conduct the test, individuals sit in a chair 20 feet away from the Snellen chart and look through a device that contains various lenses. The doctor changes the lenses and asks patients which ones allow them to see the letters most clearly.

Ophthalmology examination
The ophthalmology exam involves several quick tests. One is dilation of the pupils, which allows the ophthalmologist to evaluate the health of the retina and the optic nerve. Another is a measure of the intraocular pressure of the eyes. This test, known as tonometry, can be done in several different ways.

The most common way is for patients to stare through an examination device while the doctor applies a rapid puff of air to the eye. The machine can determine eye pressure by measuring the light reflections off the eye.

Some doctors use a slit lamp. In this test, eye drops are administered to numb the eyes and a strip of paper containing dye is gently tapped on the cornea. Patients are then told to look through a device called a slit lamp. The doctor adjusts the tip of the tonometer until it barely touches the cornea to get a reading. Another test is done to check whether patients have an adequate amount of tears. After numbing the eyes, a tiny strip of paper is placed inside the lower eyelids.

After several minutes, the doctor removes the paper to determine how much moisture the eyes can produce. The results of these tests, plus additional information about a patient's overall health, are all taken into consideration when determining whether an individual is a candidate for lasik surgery.

Chris Tan is an expert on the latest advancements in eye surgeries such as Lasik Eye Surgery and the procedures that go hand in hand with them. He has also written many insightful articles about eye care, lasik side effects, its cost, and shared helpful tips pertaining to eye care. He recommends ClearVision Eye Clinic and LASIK Center, if you are ever in need of such services as they practice the utmost care in safety procedures during operations.

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