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Fig. 2 | Malaria Journal

Fig. 2

From: Grading fluorescein angiograms in malarial retinopathy

Fig. 2

Definitions of retinal areas. Schematic retina from [8] adapted to show three different extents of peripheral retina for the right eye (Table 1). The disc and vessels are shown for reference. Note that the disc is always on the nasal edge of the macula. The distance from the outer edge of the disc to the centre of the fovea is referred to as one disc-fovea distance, and is equivalent to ~2.5 ETDRS disc diameters. Working from the centre of the image outwards, the fovea and macula are shown as circles (broken lines). The red circle indicates the limit of zone 1, which extends one disc-fovea distance beyond the macula. The blue circle indicates the limit of zone 2, which extends a further disc-fovea distance from zone 1. Zone 3 includes all retina outwith the blue circle. The outer black circle nominally represents the ora serrata, but note the actual distance between the zone 2/3 boundary and the ora is much greater than suggested by this diagram. Superior, temporal, inferior, and nasal quadrants are shown by broken lines extending from the edge of the macula

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