Clinical evaluation of a commercial photorefractor.
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.
Morgan
K S
KS
LSU Eye Center, Department of Ophthalmology, New Orleans 70112.
Johnson
W D
WD
D002648:Child; D002675:Child, Preschool; D005069:Evaluation Studies as Topic; D005128:Eye Diseases / Q000175:diagnosis*; D005188:False Negative Reactions; D006801:Humans; D007223:Infant; D010781:Photography / Q000295:instrumentation* / Q000379:methods