Keratoconus [KC] is a progressive, non inflammatory ectatic, bilateral (but usually asymmetrical) disease of the cornea, characterized by paraxial stromal thinning that leads to conical protrusion especially at the central and inferior paracentral areas. It may presents as a subclinical form (Forme Fruste Keratoconus) which is crude incomplete form of the disease that may present with non-specific symptoms such as glare and frequent change of glasses due to variable degrees of irregular myopic astigmatism. Early detection of FFKC has become of great significance recently as it becomes one of the most important risk factors for post LASIK ectasia. Using Videokeratography indices such as KISA value ranging between 60% and 100% it may be a diagnosis for FFKC. The Orbscan II corneal topography is currently used as it combines both placid and scanning slit techniques .In FFKC, there may be inferior thinning together with posterior elevation map changes. Using the pentacam maps, When the hot spot on the tangential map, relative pachymetry map and back-elevation map are all at the same point, the diagnosis of Forme Fruste Keratoconus is confirmed.