Structure-Function Analysis of MP-3 Microperimetry versus Octopus Perimetry in Central Glaucomatous Visual Field Defects.

Introduction: The aim of this study was to compare the structure-function relationship with microperimetry and Octopus perimetry in primary open-angle glaucoma (POAG) patients with central visual field (VF) defects.

Methods: Forty eyes of 24 patients with POAG were enrolled. Circumpapillary retinal nerve fiber layer (cpRNFL) analysis measured by spectral-domain optical coherence tomography (SD-OCT) of the superotemporal, temporal, and inferotemporal optic-nerve head sectors were related to corresponding microperimetric and Octopus VF clusters using the G2 grid-pattern with dynamic strategy, respectively. The structure-function relationships of both devices were assessed via a segmented regression, as well as linear regression across overall SD-OCT cpRNFL values and outside normative (<1%) SD-OCT cpRNFL values.

Results: Linear and segmented regression fits were similar with both devices. Across overall cpRNFL sectorial values, structure-function relations for the superotemporal, temporal, and inferotemporal sectors were R2 = 0.176 (p = <0.001), R2 = 0.008 (p = 0.069), and R2 = 0.294 (p = <0.001) for microperimetry and R2 = 0.189 (p = <0.001), R2 = 0.020 (p = 0.002), and R2 = 0.326 (p = <0.001) for Octopus perimetry. For corresponding values outside normative limits (<1%), the relationships were R2 = 0.113 (p = <0.001), R2 = 0.001 (p = 0.836), and R2 = 0.420 (p = <0.001) for microperimetry and R2 = 0.192 (p = <0.001), R2 = 0.002, (p = 0.336), and R2 = 0.366 (p = <0.001) for Octopus perimetry.

Discussion/conclusion: Structure-function analysis was similar for both devices. Fundus-tracking should be further evaluated in a longitudinal setting in patients affected by glaucoma.