By contrast, high values of move 3–5, move ≥6, TFF, BF, and PSD tend to lower MD values. High FL and FP rates tend to raise MD values. The best model to predict MD values included FL rate, FP rate, move 3–5, move ≥6, TFF, BF, and PSD as dependent variables with coefficients of 0.90, 9.2, −0.57, −0.52, −2.2, −1.1, and −0.56, respectively ( P < 0.001). Patients' mean MD progression rate was −0.23 dB/y. Main outcome measures included parameters related to over- or underestimation of MD values. The relationship between mean deviation (MD), fixation losses (FLs), false-positives (FPs), false-negatives (FNs), move 1–2, move 3–5, move ≥6, TFF, BF, and pattern standard deviation (PSD) were evaluated using linear modeling. In addition, average tracking failure frequency (TFF) and average blinking frequency (BF) were calculated. Average frequency of eye movement between 1° and 2° (move 1–2), 3° and 5° (move 3–5), and greater than or equal to 6° (move ≥6) were calculated. For the observational procedure, visual fixation was assessed using the gaze fixation chart at the bottom of the VF (Humphrey Field Analyzer, 30-2 SITA standard) printout. The study population consisted of 631 eyes of 400 patients with open angle glaucoma in an institutional practice, with 10 visual fields (VFs). We evaluated the usefulness of gaze tracking (GT) results as an index of visual field reliability in glaucoma.
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