Corneal topography to help detect keratoconus.

1. The incidence of keratoconus is about 1 in 2,000 in the general population, but is believed to be higher if subclinical forms are taken into account. 2. Corneal topography helps to detect keratoconus when other testing methods may have missed early signs of the disease. 3. At a time when refractive surgery is common, it is essential to identify corneal abnormalities prior to surgery.