1. Fourier analysis on irregular corneal astigmatism using optical coherence tomography in various severity stages of keratoconus

    Fourier analysis on irregular corneal astigmatism using optical coherence tomography in various severity stages of keratoconus

    Design : Prospective cross-sectional study Methods : The study included 126 eyes with clinical KC (50 KC without any corneal scar, 50 KC with anterior corneal scar, and 26 KC with posterior scar having a history of acute corneal hydrops), 50 with topographic KC (without clinical signs), 50 with pre-topographic KC (normal topography without clinical signs), and 50 controls. Corneal tomographic data were obtained using anterior segment optical coherence tomography (OCT). Fourier analysis decomposed dioptric data from both anterior and posterior corneal surface into spherical, regular astigmatism, asymmetry, and higher-order irregularity components. The discriminating ability of the Fourier indices of pre-topographic KC ...

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