Purpose. To investigate the effects of Bangerter filters on the visual field in healthy and in amblyopic patients.Materials and Methods. Fifteen normal adults and fifteen anisometropic amblyopia patients were analysed with standard automated perimetry (SAP) and frequency doubling technology (FDT) at baseline and with filters 0.8 and 0.1.Results. With 0.1 filter in SAP there was an increase of MD compared with controls (−10.24 ± 1.09 dB) in either the amblyopic (−11.34 ± 2.06 dB;P<0.050) or sound eyes (−11.34 ± 1.66 dB;P<0.030). With filters 0.8 the PSD was increased in the amblyopic eyes (2.09 ± 0.70 dB;P<0.007) and in the sound eyes (1.92 ± 0.29 dB;P<0.004) compared with controls. The FDT-PSD values in the control group were increased with the interposition of the filters compared to baseline (0.8;P<0.0004and 0.1;P<0.0010). We did not find significant differences of the baseline PSD between amblyopic eyes (3.80 ± 2.21 dB) and the sound eyes (4.33 ± 1.31 dB) and when comparing the filters 0.8 (4.55 ± 1.50 versus 4.53 ± 1.76 dB) and 0.1 (4.66 ± 1.80 versus 5.10 ± 2.04 dB).Conclusions. The use of Bangerter filters leads to a reduction of the functionality of the magno- and parvocellular pathway.
The ability of frequency doubling technology (FDT) perimetry to predict the onset of glaucomatous visual field loss for standard automated perimetry (SAP)