Topography maps the eye's front surfaces, called the cornea. We use a special
type of topographer, called 'Wavefront mapping', similiar to what is used for LASIK.
This helps us determine the best method for your vision correction.
'Wavefront' mapping shows natural aberrations within your eyes.
This may reduce sharpness of your best corrected vision.


Top left image shows curve of eye before CRT. Bottom left image shows
changes to the corneal surface. Right image shows the maximal change
to correct vision.