Journal
INVESTIGATIVE OPHTHALMOLOGY & VISUAL SCIENCE
Volume 57, Issue 9, Pages OCT486-OCT494Publisher
ASSOC RESEARCH VISION OPHTHALMOLOGY INC
DOI: 10.1167/iovs.15-18907
Keywords
retinal vein occlusion; optical coherence tomography angiography; foveal avascular zone; perifoveal retinal capillary plexus; vascular perfusion
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Funding
- Massachusetts Lions Club Research Fund
- CAPES Foundation, Ministry of Education of Brazil, Brasilia, DF, Brazil
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PURPOSE. To evaluate the perifoveolar retinal capillary network at different depths and to quantify the foveal avascular zone (FAZ) in eyes with retinal vein occlusion (RVO) compared with their fellow eyes and healthy controls using spectral-domain optical coherence tomography angiography (SD-OCTA). METHODS. We prospectively recruited 23 patients with RVO including 15 eyes with central RVO (CRVO) and 8 eyes with branch RVO (BRVO), their fellow eyes, and 8 age-matched healthy controls (8 eyes) for imaging on prototype OCTA software within RTVue-XR Avanti. The 3 x 3 mm and 6 x 6 mm en face angiograms of superficial and deep retinal capillary plexuses were segmented. Perifoveolar retinal capillary network was analyzed and FAZ was quantified. RESULTS. Decrease in vascular perfusion at the deep plexus was observed in all eyes with CRVO (8/8, 100%) and BRVO (6/6, 100%) without cystoid macular edema, and in 8 of 15 (53%) and 2 of 8 (25%) of the fellow eyes, respectively. Vascular tortuosity was observed in 13 of 15 (87%) CRVO and 5 of 8 (63%) BRVO eyes. Collaterals were seen in 10 of 15 (67%) CRVO and 5 of 8 (63%) BRVO eyes. Mean FAZ area was larger in eyes with RVO than their fellow eyes (1.13 +/- 0.25 mm(2) versus 0.58 +/- 0.28 mm(2); P = 0.007) and controls (1.13 +/- 0.25 mm(2) versus 0.30 +/- 0.09 mm(2); P < 0.0001), and in fellow eyes of RVO patients when compared to controls (0.58 +/- 0.28 mm(2) versus 0.30 +/- 0.09 mm(2); P = 0.01). CONCLUSIONS. Spectral-domain OCTA reveals abnormalities at different levels of perifoveolar retinal capillary network and is able to quantify the FAZ in RVO. Longitudinal studies may be considered to evaluate the clinical utility of OCTA in RVO and other retinal vascular diseases.
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