Primary objective of this study was evaluate the diagnostic capacity of fourier analysis of keratometric data in differentiating moderate KC and FFK from healthy corneas. Study participants were recruited from the Cornea Outpatient service in a consecutive if eligible basis. Two study groups were formed: a)KC group included patients those were diagnosed and classified for moderate keratoconus according to the Amsler-Krumeich classification system, b) FFK group (FFKG) that included patients diagnosed with FFK, and c) Control group (CG) was formed by refractive surgery candidates. Pentacam (Pentacam HR, Oculus Optikgerate GmbH, Heidelberg, Germany)measurements were performed by the same experienced operator in a consistent way.
Study Type
OBSERVATIONAL
Enrollment
185
Eye Institute Of Thrace
Alexandroupoli, Evros, Greece
Spherical Component (SphRmin)
Spherical Component (SphRmin) displays the arithmetic mean of all radii of curvature for each ring
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Spherical Eccentricity (SphEcc)
Spherical Eccentricity is the asphericity that is calculated
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Maximum Decentration (MaxDec)
decentration or asymmetry of the astigmatic component which is derived from first order component of fourier analysis
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Regular Astigmatism at the Center(AstC)
the regular astigmatic component is calculated in the center and it is derived from the second order component of Fourier Analysis
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Regular Astigmatism at the Periphery (AstP)
the regular astigmatic component is calculated in the periphery and it is derived from the second order component of Fourier Analysis
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Mean Astigmatism (MAst)
Mean Astigmatism is the average of astigmatism at the center and the periphery (MAst)
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Irregularitiy (Irr)
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Astigmatism at the Center plus the Irregularities (AstCir)
the irregularities of the cornea which can not be corrected by sphere, cylinder or prism and it is derived from higher order components of Fourier Analysis of Keratometric Data
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Total Astigmatism (Tast) which is the sum of Mean Astigmatism and Irregularities.
Total Astigmatism (Tast) is the sum of Mean Astigmatism and Irregularities.
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