The Structure-Function Relationship between Macular Morphology and Visual Function Analyzed by Optical Coherence Tomography in Retinitis Pigmentosa

Figure 1

Representative image showing 2 methods for calculating the PROS area in the same patient. The PROS area measurement method using the horizontal and vertical PROS lengths of the high-definition (HD) scan is illustrated in (a)–(c), and the method using an en-face image of advanced visualization is demonstrated in (d)-(e). Horizontal HD scan (a) and vertical HD scan (b) of the same patient. The arrow indicates the PROS length (†: horizontal PROS length and ‡: vertical PROS length). The presumptive PROS area derived from the horizontal and vertical PROS lengths. Area of ellipsoid = π  × (horizontal length/2) × (vertical length/2) (c). Horizontal scan showing the slab layer (d). The dotted line marked by the arrowheads is the slab layer. The arrowheads indicate the photoreceptor IS/OS junction. An en-face image of the slab layer (e). The brighter region (surrounded by the arrows) is the preserved PROS area, and the darker region is the area where the PROS was not detected by OCT. Manual demarcation of the PROS area was carried out by using Photoshop CS 3.0 (f).