Keratoconus and ectatic corneal diseases have been recognized for more than 150 years.1,2 Over the last 2 decades, there has been a revolution in the knowledge related to the diagnosis and management of these conditions. In terms of diagnosis, the advent of corneal topography, and more
recently corneal tomography, has increased the ability of ophthalmologists to identify corneal ectasia at a much earlier stage than was previously possible.3 As a result, the previously established prevalence of keratoconus of approximately 1/2000 among the general population4 has been challenged with much higher prevalence rates found in many parts of the world.
