1. Optical quality assessment in normal and forme fruste keratoconus eyes with a double-pass system: a comparison and variability study

    Optical quality assessment in normal and forme fruste keratoconus eyes with a double-pass system: a comparison and variability study

    Purpose To comparatively evaluate the image quality in normal and forme fruste keratoconus patients using a double-pass system. Methods Fourteen normal eyes and 15 eyes with forme fruste keratoconus were included. Corneal tomographic parameters were obtained with optical coherence tomography. Image quality characteristics were determined by an optical quality analysis system (OQAS). Two readings were obtained from each eye. The following parameters were analysed: modulation transfer function cutoff frequency (MTF), Strehl ratio and OQAS values (OV) at contrasts of 100% (OV-100), 20% (OV-20) and 9% (OV-9). Repeatability coefficient (RC), coefficient of variation (CVw) and intraclass correlation coefficient (ICC) were evaluated ...

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