Role of Anterior Segment Optical Coherence Tomography in the Diagnosis of Subclinical Keratoconus in Comparison with the Pentacam

Abstract

eratoconus is a progressive, ectatic corneal disorder, characterized by protrusion of the cornea and thinning of the corneal stroma, causing astigmatism. The etiology of keratoconus is still largely unknown, although many biochemical and pathological changes at the structural and cellular level of the corneal abnormalities have been suggested. There are no clinical criteria for "Frome Fruste" keratoconus or keratoconus suspect diagnosis but it usually starts as inferior localized steeping. It is of critical importance to detect subclinical keratoconus cases especially for refractive surgery candidates. Role of the pentacam has been well established for screening form fruste keratoconus in ophthalmology practice. The tremendous evolution from keratometry to corneal topography has continued into tomography. Careful attention for the color scale choice should be taken. Elevation maps should be referenced to the Best Fit Sphere or Best Fit Toric Ellipsoid for the 8mm area. The values at the thinnest point provide the most reproducible parameter. Belin Ambrosio Enhanced Ectasia Display, provide a comprehensive refractive surgical screening tool to assist the refractive surgeon in