Screening for glaucomatous visual field loss with frequency-doubling perimetry

Abstract

Purpose To conduct a preliminary evaluation of the efficacy of the frequency - doubling contrast test as a means of screening for glaucomatous visual field loss. Methods The sample contained 120 glaucome eyes and 64 normal eyes. All subjects underwent frequency- doubling perimetry (using the the threshold mode) and conventional perimetry (using the program 30 - 2 of the Humphrey Field Analyzer) . Results The sensitivity and specificity of the frequency - doubling contrast test were 104/120(86,7%) and 55/64(85.9%) respectively.There was a significant correlation between the result of the two techniques applied in normal people and glaucoma patients (r = 0.948,p 0.001 in MD, r= 0.712, p 0.001 in PSD). Conclusion The frequency - doubling contrast test is a useful method for detecting glaucomatous visual field loss.