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    Novel device reliably measures iridocorneal angles

    Scheimpflug photography using a novel device (Sirius, Costruzione Strumenti Oftalmici) provides consistent measurements of the iridocorneal angle at different meridians in healthy eyes and could be used to detect occludable angles, according to Dra. Clara Ruiz-Belda, Vithas Medimar International Hospital, Alicante, Spain, and colleagues.

    The researchers published the finding in Graefe’s Archive for Clinical and Experimental Ophthalmology.

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    Innovations, such as minimally invasive glaucoma surgery and selective laser trabeculoplasty, have made measurement of the iridocorneal angle increasingly important in treating glaucoma. It is also an important consideration in implantation of an angle-supported phakic IOL.

    Gonioscopy, the gold standard for measurement of the iridocorneal angle, requires practice and can be time-consuming.

    The Sirius system—a non-contact 3D rotating Scheimpflug camera combined with a Placido ring—provides another alternative for anatomical measurements of the anterior segment. But scant research has explored the system’s consistency and repeatability in measuring the anterior segment, some researchers have noted.

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    To fill that gap, Dra. Ruiz-Belda and colleagues recruited 43 patients ranging in age from 36 to 79 years and measured one eye in each patient. The researchers selected the patients at random from anterior segment consultation at the Department of Ophthalmology of the Vithas Medimar International Hospital.

    All the eyes in the study were healthy and had a refraction error between +5.00 D and -10.00 D. The researchers excluded patients who had undergone ocular surgery, or had glaucoma or another active ocular disease.

    A single experienced examiner analyzed the corneal topography and anterior segment of one eye in each patient with the device. He measured nasal and temporal angles at 0°, ±10°, ±20°, and ±30° meridians a total of three times in each eye.

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    The researchers then calculated the within-subject standard deviation (Sw) as a way of estimating the size of measurement error. They defined intra-observer precision as ±1.96 x Sw, indicating the range of error size of the repeated measurements for 95% of observations. They found that the Sw was below 3.50° in all cases.

    Calculating the coefficient of variation

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