Topography

It is a non-contact examination that photographs the surface of the eye. Corneal topography is not a routine test. Rather, it is used in diagnosing certain types of problems, in evaluating a disease’s progression, in fitting some types of contact lenses, and in planning surgery. Corneal topography is a special photography technique that maps the surface of the clear, front window of the eye (the cornea). It works much like a 3D (three-dimensional) map of the world that helps identify features like mountains and valleys.