Corneal topography is an important test we use to map your cornea’s curvature. The amount of curve of the cornea determines how much light rays are bent before reaching the back of your eye. This is what allows the eye to keep the images that you look at in focus so that you can see clearly. Therefore any irregularities (flattening or steepening) in its shape will cause you to see blurry.
-Planning for laser eye surgery (LASIK, PRK)
-Preparation for other procedures (PTK, some cataract surgeries)
This test is used in preparation for refractive surgery (laser eye surgery), as the map of the curve helps guide laser treatment. It is also used to assist in the diagnosis and monitoring of conditions such as keratoconus (steepening of the cornea).
Topography is a non-invasive test, meaning that you will not be subjected to any radiation, medication, or touching of your eyes. The test is completely painless, and only lasts a few seconds. You will be seated in front of a machine that will shine an illuminated pattern onto your cornea. As this pattern reflects off the surface of your cornea, its shape is captured by a camera. A computer will analyze this, and generate a map to show us if there is flattening or steepening of the cornea.
Purple corresponds to the flattest areas while red corresponds to the steepest areas.