Corneal topography, also known as corneal mapping, is diagnostic testing which renders detailed, 3D maps of the surface of the cornea, the clear, front window of the eye. 

The cornea is responsible for most of the eye’s focusing power. Any irregularities in the shape of the cornea can lead to distortions in vision. With a corneal topography scan, your eye doctor can identify irregularities or distortions in the cornea. 

What is corneal topography used for?  

Corneal topography is useful for planning eye surgery, monitoring and treating corneal conditions, and fitting contact lenses. Your eye doctor may recommend a corneal topography scan for several different reasons: 

  • Contact lens fitting
  • Evaluation of astigmatism
  • Evaluation of dry eye
  • Pre-operative assessment for LASIK surgery  

What to expect when getting a corneal topography scan 

Getting a corneal topography scan is non-invasive and painless. Nothing touches your eyes at any time. You will be seated in front of the corneal topographer and asked to stare at a fixed target inside the machine while pictures of your eyes are taken. The scan only takes a few seconds to complete.  

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