Comparison of Matrix Frequency Doubling Perimetry (FDT) Versus Swedish interactive thresholding Algorithm (SITA) Standard Automated Perimetry in Mild Glaucoma

Azadeh Doozandeh, Farnoosh Irandoost, Ali Mirzajani, Shahin Yazdani, Mohammad Pakravan, Hamed Esfandiari


We aimed to correlate second-generation frequency-doubling technology(FDT) perimetry  with standard automated perimetry (SAP) in mild glaucoma

Forty-seven eyes of 47 participants who had mild visual field defect by SAP, were studied the visual field of All  participants were examined by SITA  24-2, SAP and matrix 24-2, FDT. The correlation of global indices and the number of defects on pattern deviation (PD) plots were assessed. Agreement between two sets regarding the stage of visual field damage was assessed. Using SPSS 24.0 we calculate Pearson comparison, Intra-cluster comparison, paired t-test and 95% limit of agreement. The level of significance was set 0.05.

Although there was no significant statistical difference between global indices, agreement between two devices in the term of global indices was weak. (The limit of agreement for mean deviation was -6.08 to 6.08 and LoA for pattern standard deviation was -4.42 to 3.42). The agreement between the SITA-SAP and Matrix-FDT regarding the glaucoma hemifield test (GHT) and number of defective points in each quadrant and staging of the visual field damage was also weak.

Since the correlation between Matrix-FDT and SITA-SAP in terms of global indices, GHT, number of defective points and stage of the visual field damage in mild glaucoma is weak; Matrix-FDT cannot be used interchangeably by SITA-SAP in the early stage of glaucoma.

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