Computerized corneal topography is the most advanced technique for preparing a map of the corneal surface, allowing the quantification and analysis of minute changes in shape and refractive power across the entire cornea induced by disease or surgery. The Orbscan three-dimensional topographer has proven to be a very fast, accurate and reliable system for the evaluation of corneal ectasias such as keratoconus.

Pupillary dilation is not required for its performance and its duration is approximately 25 minutes.