Correlation of Binocular Perimetry Screening using imo, a Portable Head Mounted Perimeter with 10-2 Standard Automated Perimetry for Early Glaucoma with Central Visual Field Defects.

Prcis: The screening program using imo strongly correlates with 10-2 Standard automated perimetry in detecting central visual field defects in early glaucoma, highlighting its potential as a valuable tool for efficient screening and severity quantification.

Purpose: To investigate the correlation between abnormalities within the central 10° of the screening program using imo, a portable head-mounted perimeter, and 10-2 standard automated perimetry in early-stage glaucoma with central visual field defects.

Methods: This retrospective study included early glaucoma with (26 eyes) and without (38 eyes) central visual field defects. The correlation between the numbers of abnormal points within the central 10° of the imo screening program and those in the probability plot of 10-2, and mean total deviation and pattern deviation, were analyzed.

Results: The imo screening program demonstrated sensitivity (80%) and specificity (98.7%) in detecting abnormalities, with a 91.6% agreement rate of 10-2. The mean number of anomalies in the 10-2 plot (pattern deviation) with P<1% was 0.85, 7.75, and 9.69 (95% confidence interval: 0.18-1.51, 5.38-10.1, and 6.89-12.5, respectively) for no, one, and two anomalies in the imo screening program, respectively. The number of anomalies with P<1% was significantly higher when the imo screening program detected one anomaly versus none (P<0.01), and two versus one (P<0.05). Mean total deviation values were -1.15, -7.5, and -15.2 (95% confidence interval: -2.32 to 0.03, -11.21 to -3.78, and -19.7 to -10.6, respectively), while mean pattern deviation values were -1.57, -9.0, and -16.0 (95% confidence interval: -2.57 to -0.57, -12.5 to -5.49, and -21.4 to -10.7, respectively), for no, one, and two anomalies in the imo screening program, respectively.

Conclusions: The imo portable head-mounted perimeter was found to correlate with 10-2 standard automated perimetry in glaucoma patients with central visual field defects and has the potential to shorten visual field testing times.