The cornea is the transparent layer forming the front of the eye. It acts like a lens in the eyes focussing system, hence the steeper it is the more power the eye has and the flatter it is the less power the eye has.
We use a Corneal Topographer to map out the curvature of the front of the eye. This is important as we can use this information to help us fit lenses or to see if the front of the eye is damaged or irregular in some way.
We see many patients with keratoconus and for these patients the cornea has thinned and changed shape. Keratoconus is diagnosed by corneal topography. We can also use topography to see corneal dystrophies and corneal astigmatism.