Fig. 2.

Compound analysis of retinal vessel tree, visual field function (in dB), determination of branch order for arteries (A1-3) and veins (V1-3). A Example of a retinal image with a superimposed 30–2 visual field test pattern (retina image resolution: 2452 × 2056 pixels; visual field size: 50° × 42°). The linear scaling was 2452/50 = 49 pixel/degree. The 30–2 pattern centers on the macula with the same linear scaling. The inter-point distances is 6° × 49 pixel/degree = 294 pixels. The retina image was divide into 6° × 6° squares centering on every visual field testing point. The pattern deviation result was assigned to the corresponding retina image squares (vertically flipped to match orientation). B Example how two vessels (A2, V1) located in the black square were assigned to their pattern deviation value (− 13 dB) according to the map shown in A. C Example of branch order analysis of levels 1–3 and how they were matched with the visual field defect values: A1 (first branch level) was located in the mild defect visual field area, A2 (second branch level) in a moderate defect, and A3 (third branch level) in a severe visual field sector