Journal
INVESTIGATIVE OPHTHALMOLOGY & VISUAL SCIENCE
Volume 57, Issue 11, Pages 4679-4685Publisher
ASSOC RESEARCH VISION OPHTHALMOLOGY INC
DOI: 10.1167/iovs.16-19315
Keywords
choroid; ischemic; NAION; peripapillary
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Funding
- National Eye Institute (Bethesda, MD, USA) [R01 EY018926, U10 EY14267, EY019869]
- National Institute on Aging (Bethesda, MD, USA) [R01 AG04212]
- Eyesight Foundation of Alabama (Birmingham, AL, USA)
- Research to Prevent Blindness (New York, NY, USA)
- Alfreda J. Schueler Trust (Chicago, IL, USA)
- National University of Singapore Young Investigator Award (Singapore, Singapore) [NUSYIA_FY13_P03]
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PURPOSE. This study examined the peripapillary choroidal thickness (PCT) in nonarteritic ischemic optic neuropathy (NAION) in comparison to contralateral eyes and normal eyes. METHODS. We used enhanced depth imaging spectral-domain optical coherence tomography to image the optic nerve head of 20 NAION, 10 contralateral eyes, and 102 normal eyes. Following compensation, the scans were manually delineated to identify relevant surfaces including Bruch's membrane opening (BMO), Bruch's membrane, and anterior sclera. The PCT was defined as the measurement between Bruch's membrane and the anterior sclera and was measured at increasing distance from BMO. Models adjusted for age, BMO area, and axial length were used to compare the mean PCT between NAION and normal eyes, and contralateral eyes and normal eyes. Paired t-tests were used to compare the PCT between NAION and contralateral eyes. RESULTS. The mean PCT was thicker in NAION and contralateral eyes when compared with normal eyes at all distances from BMO (P < 0.001). The PCT was not significantly thicker in contralateral eyes when compared with affected NAION eyes. Choroidal thickness was thinnest in the inferior quadrant in all eyes regardless of the group. CONCLUSIONS. Increased peripapillary choroidal thickness was noted in both NAION and contralateral eyes. The thicker choroid may be an associated feature or a result of the disorder. Although further longitudinal study is required to determine causation, these findings may suggest that a thickened peripapillary choroid may be a component of the disk-at-risk clinical phenotype.
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