1. Repeatability of Optic Nerve Head Parameters Measured by Spectral-Domain OCT in Healthy Eyes

    Repeatability of Optic Nerve Head Parameters Measured by Spectral-Domain OCT in Healthy Eyes
    BACKGROUND AND OBJECTIVE To evaluate the repeatability of optic nerve head (ONH) measurements by spectral-domain optical coherence tomography. PATIENTS AND METHODS Three scans were acquired in 32 healthy subjects during one session. Using Cirrus HD-OCT (Carl Zeiss Meditec, Dublin, CA), the cup-to-disc ratio (CDR), disc area, rim area, cup volume, and horizontal and vertical CDRs were investigated. Repeatability was assessed by the coefficient of variation (COV), the test–retest intrasession variability, and the intraclass correlation coefficient (ICC). RESULTS Good repeatability was achieved for all parameters, with a COV of 4.23% or less and ICCs of 0.98 or greater ...
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