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November 1987

Clinical Evaluation of a Commercial Photorefractor

Author Affiliations

From the LSU Eye Center, Department of Ophthalmology (Dr Morgan), and the Department of Biometry (Dr Johnson), Louisiana State University Medical Center School of Medicine, New Orleans.

Arch Ophthalmol. 1987;105(11):1528-1531. doi:10.1001/archopht.1987.01060110074035

• The Visiscreen 100 is a system designed to detect ocular anomalies photographically. Photorefractions obtained in 63 consecutive 3-month-old to 8-year-old patients were compared in a masked fashion with results obtained by conventional techniques, including cycloplegic refraction. In 87% of the 57 patients with analyzable photographs, photorefractive and examination results correlated for the detection of constant tropias. The photorefractor detected all ocular media opacities. In 77% of the cases, its refraction was within 2.5 diopters or 33% of the cycloplegic spherical equivalent. In detecting abnormal ocular status, the Visiscreen had a 91% sensitivity and a 74% specificity. The overall agreement rate in distinguishing abnormal from normal status was 84%. Most errors were related to inaccuracies in fixation and positioning, rather than the optical principles utilized. This device offers a rapid technique for the detection of factors predisposing preverbal children to amblyopia.