To investigate the variation in backscattering with depth between forme fruste keratoconus (FFKC), keratoconus, and normal eyes; to determine the backscattering changes in the characteristics of keratoconus progression; and to explore the diagnostic value of backscattering in FFKC.
To investigate the variation in backscattering with depth between forme fruste keratoconus (FFKC), keratoconus, and normal eyes; to determine the backscattering changes in the characteristics of keratoconus progression; and to explore the diagnostic value of backscattering in FFKC. A Scheimpflug corneal tomography image and caliper tool were used to obtain backscatter at every 2% depth at the thinnest point of the cornea, with the measured values expressed in grayscale units (GSU).
Study Type
OBSERVATIONAL
Enrollment
223
Tianjin Eye Hospital
Tianjin, Tianjin Municipality, China
backscattering
Standard measurements were performed using a Pentacam (Pentacam HR; Oculus, Wetzlar, Germany);The average brightness of a predetermined area of the cornea was calculated, shown as densitometry, and recorded in GSU ranging from 0 to 100 (0, cornea is transparent without opacity; 100, cornea is completely opaque).
Time frame: through study completion, an average of 1 year
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