PMC3632629_01
Macular images and retinal thickness maps obtained by SD-OCT before and after the development of a macular PVD. (A, C, E, and G) Before the macular PVD; (B, D, F, and H) after the macular PVD. (A and B) SD-OCT horizontal B-scan images of the retina through the fovea. (C and D) Infrared image overlaid by macular thickness map on the SD-OCT cube scans. (E and F) Three-dimensional surface map from SD-OCT cube scans. (G and H) Average regional macular thickness as per Early Treatment Diabetic Retinopathy Study subfields.. Abbreviations: ILM, internal limiting membrane; PVD, posterior vitreous detachment; RPE, retinal pigment epithelium; SD-OCT, spectral-domain optical coherence tomography.
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However, a perifoveal PVD was detected in the SD-OCT images of the left eye (Figure 1A). One year later, a macular PVD was found in the SD-OCT images of the left eye with a detached posterior hyaloid membrane and an operculum over the fovea (Figure 1B). The macular thickness maps and surface maps clearly showed changes in the foveal shape, namely, a widening and deepening of the foveal floor (Figures 1C-F and 2A-D). At the same visit, the average regional retinal thickness in the ETDRS chart (Figure 1G and H) was decreased by 1.4% to 13.0% (Table 1).
Method of measuring foveal pit shape. (A and C) Before the macular PVD; (B and D) after the development of a macular PVD. (A and B) Foveal rim indicated by red circular lines on the macular thickness maps. Moving away from the foveal center, the rim of the foveal pit is identified as a location of 0 slope. (C and D) Three-dimensional foveal pit shapes between the "pit lid" (a plane fit to the pit rim) and the ILM.. Notes: Pit depth and pit volume were defined as the largest distance and volume between the pit lid and ILM, respectively. Pit area was defined as the enclosed area of the pit rim.. Abbreviations: ILM, internal limiting membrane; PVD, posterior vitreous detachment.
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The macular thickness maps and surface maps clearly showed changes in the foveal shape, namely, a widening and deepening of the foveal floor (Figures 1C-F and 2A-D).