What Does this Test Do? Part 2: Topography

Corneal Topography rings
Corneal Topography Test

As you look into through the bright red colored rings, the topography machine creates a map of the clear front portion of your eye, the cornea.  Corneal topography allows us to detect irregular conditions of the surface that can’t be measured in other ways.

How does a map of the cornea help us evaluate your vision?

A healthy cornea is very important to your vision, because 77% of the eye’s focusing ability is done by the cornea.  Light enters the eye through the clear cornea. The shape and curve of the cornea plays an important role in the quality of vision. An eye with normal vision has an evenly rounded cornea, like a basketball.  An eye with an astigmatism has an unevenly curved cornea, more like a football.

Corneal topography is performed by projecting lighted rings onto the surface of the eye.  These rings are reflected back and measured by the instrument, and a map of the cornea is created.

Topography is an important tool in measurements for LASIK Surgery.  LASIK surgical correction changes the shape of the cornea to help patients see more clearly.  During LASIK, the shape of the cornea is changed to help images focus properly on the retina. Below you can see how the shape of the eye is changed with the laser after LASIK surgery. The photos show the same eye before and after LASIK.

Corneal Topography is just one of the testing resources that we use when treating our patients.  You can trust Moran Eye Associates to use the tools that we need to keep your eyes healthy, and your vision the best it can be.  If you have questions about your vision, contact Moran Eye Associates.  We focus on making vision clearer.

 

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