Fig 1.
Measurement of deep peripapillary microvascular density in the β-peripapillary atrophy (β-PPA) area.
(A) Boundaries of the optic disc, β-PPA, and overlying superficial large vessels delineated. After excluding the area occupied by overlying superficial large vessels, the β-PPA was divided into 7 areas. The choroidal vessel density of each area was automatically measured using the built-in drawing tool of Avanti OCT software. The average choroidal vessel density of 7 areas was calculated and referred to as deep peripapillary microvascular density. (B-C) Corresponding scanning laser ophthalmoscopy image (B) and fundus photography image (C).
Table 1.
Comparison of subject characteristics according to the myopic degree and optic disc rotation direction.
Table 2.
Factors associated with superficial peripapillary microvascular reduction (< 60%) in healthy myopic eyes.
Table 3.
Factors associated with deep peripapillary microvascular reduction (< 70%) in healthy myopic eyes.
Fig 2.
Scatter plots illustrating the linear correlation between peripapillary microvascular density and ocular parameters.
(A-B) Relationship between the superficial peripapillary microvascular density and axial length (A) and average peripapillary retinal nerve fiber layer (pRNFL) thickness (B). (C-D) Relationship between the deep peripapillary microvascular density and degree of optic disc rotation (C) and inside disc vessel density (D).
Fig 3.
Two representative cases of healthy myopic eye with similar degree of axial myopia and different degrees of ovality index and optic disc rotation.
(A) OCT angiography image of 22-year-old man. The signal strength of the image was 76 and the deep peripapillary microvascular density was 79.17%. (B) OCT angiography image of 28-year-old man. He had a larger ovality index and more inferiorly rotated optic disc. The signal strength of the image was 80 and the deep peripapillary microvascular density was 68.55%, which is a deep peripapillary microvascular reduction.