Diagnosing keratoconus types
Optometrists diagnose the various types of keratoconus with specialised equipment. Some of these map the topography of the eye, while others measure the thickness of the cornea.
Corneal topography can be understood in the same way as the topography of hills and valleys. Cool colours (blues) represent flatter areas while hotter colours (orange and reds) indicate steepening. An optometrist can read corneal topography to help diagnose the type of keratoconus.
In addition, optometrists measure the thickness of the cornea using a global pachymeter. This instrument also aids in correctly diagnosing the type.