Comparison of corneal topography between subclinical keratoconus and progressive keratoconus

Objective To investigate the characteritics of keratoconus under corneal topography,especially the early Keratoconus.Methods 19cases of Keratoconus were examined by corneal topography,in which 5 cases were in subclinical stage 14 cases(20 eyes)progressive.The topography morphology,central corneal refractive,power,keralometry,corneal astigmatism,the surface regularity index(SRI).Results The corneal topography of subclinical keratoconus showed bow-tie pattern,and most of them is asymmetric pattern.In progressive keratoconus,central area form a cone,the shape was round,oval and papilla-like central corneal refractive power,the I-S value were different.Conclusion Corneal topography may be a useful method to early diagnosis of keratoconus.