Comparison of Optic Nerve Head Blood Flow Autoregulation among Quadrants Induced by Decreased Ocular Perfusion Pressure during Vitrectomy

Figure 1

Analysis of circulation in the optic nerve head by laser speckle flowgraphy analyzer software. (a) The margin of the optic nerve head (ONH) is identified using a circular or elliptical boundary. (b) LSFG Analyzer software (Ver. 3.1.79.0, Softcare, Ltd.) can distinguish the vessels and tissues using the automated definitive threshold. The white area indicates the vessel area while the black area indicates the tissue area. (c) Blood flow in the ONH quadrants (S: superior, I: inferior, N: nasal, and T: temporal) is calculated by using LSFG Analyzer software. MT means the tissue mean blur rate in the ONH.

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