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10 November 2018 : Clinical Research  

Agreement and Repeatability of Two Biometers to Measure Anterior Segment Components: Refractive Error Effect

Alberto Domínguez-Vicent1BCDEF*, Rune Brautaset1ABCDEF

DOI: 10.12659/MSM.907683

Med Sci Monit 2018; 24: CLR8056-8063

Abstract

BACKGROUND: To assess the repeatability and agreement between a new high-resolution optical coherence tomographer (OCT) and a Scheimpflug topographer.

MATERIAL AND METHODS: Sixty phakic and healthy participants were measured in this study, and one eye per participant was analyzed. Depending on their refractive error, each participant was allocated into a myopic, hyperopic, or emmetropic group. The Cirrus HD-OCT 5000 (Carl Zeiss Meditec, Jena, Germany), and the Sirius Scheimpflug topographer (Costruzione Strumenti Oftalmici, Florence, Italy) were used to take all measurements.

RESULTS: The repeatability of these instruments to measure the anterior chamber depth, angle-to-angle, thinnest pachymetry, and both nasal and temporal angles was smaller than 0.15 mm, 0.40 mm, 10 µm, and 10 degrees, respectively. However, the repeatability of the Scheimpflug instrument to measure the apex pachymetry was about 15 µm, and for the OCT, it was about 4 µm for all groups. On average, the Sirius Scheimpflug instrument measured shallower anterior chamber depth (about 0.10 mm), shorter angle-to-angle (about 0.5 mm), thinner corneas (approximately 10 µm), and narrower angles (around 5 degrees) for all refractive groups.

CONCLUSIONS: The repeatability of the Cirrus OCT and Sirius Scheimpflug instrument was good and independent of the refractive error. Nevertheless, to judge whether these instruments could be used interchangeable, clinical criteria are needed.

Keywords: Biometry, Refractive Errors, Tomography, Optical Coherence

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Medical Science Monitor eISSN: 1643-3750
Medical Science Monitor eISSN: 1643-3750