Identification of glaucoma-related viual field abnormality with the creening protocol of frequency doubling technology Original Reearch Article

Purpoe: To evaluate the predictive power of frequency doubling technology to ditinguih glaucoma upect from peron with glaucoma viual field lo. Method: A conecutive erie of 76 ubject referred to a glaucoma ervice underwent perimetry in one eye with frequency doubling technology in a creening mode and Humphrey 24-2 threhold teting in random order, and had optic dik and clinical nerve fiber layer grading. Reult: All ubject performed perimetry with both intrument atifactorily, with an average tet time of 1.8 ± 0.7 minute per eye for the frequency doubling technology (intrument time). Of 33 eye claified a abnormal by glaucoma hemifield tet, 91% (30/33) were abnormal on frequency doubling technology (two or more abnormal location of 17), wherea 94% (31/33) of glaucoma upect with normal Humphrey field had normal reult with frequency doubling technology. Frequency doubling technology reult were highly correlated with Humphrey mean deviation by linear regreion (r2 = .74, P = .047) and with corrected pattern tandard deviation probability value. A frequency doubling technology error core for each quadrant of the field wa highly correlated with the number of everely abnormal point per quadrant in Humphrey threhold tet (r2 = .63, P = .034). There wa cloe agreement between clinical examination of the optic dik and nerve fiber layer and frequency doubling technology reult. Three-level quantification of abnormality in frequency doubling technology reult did not add to diagnotic accuracy. Concluion: Frequency doubling technology teting how promie a a creening method in glaucoma.