It is a computerized mapping of the corneal surface.
Why the test is performed:
This test maps out the entire corneal surface, measuring its thickness, curvature and elevation.
The information produced by the topography is of importance for cases such as:
How it is performed:
Corneal topography must be performed upon a cornea “at rest” and therefore, it is essential not to wear contact lenses some days before the test.
How to prepare for the test:
Do not wear soft contact lenses for 7 days before the examination. Do not use rigid lenses for at least 15-20 days before the examination. Following these instructions is very important because contact lens wear may significantly affect the results of the examination.
Corneal topography within normal parameters