Journal
AMERICAN JOURNAL OF OPHTHALMOLOGY
Volume 150, Issue 3, Pages 325-329Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.ajo.2010.04.018
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Funding
- RESEARCH TO PREVENT BLINDNESS (NEW YORK, NEW YORK)
- National Institute of Health (Bethesda, Maryland) [R01-EY11289-24, R01-EY13178-10, R01-EY013516-07]
- Air Force Office of Scientific Research [FA9550-07-1-0101, FA9550-07-1-0014]
- Massachusetts Lions Eye Research Fund (New Bedford, Massachusetts)
- Carl Zeiss Meditec, Inc
- Optovue Corporation
- Topcon Medical Systems, Inc.
- MIT
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PURPOSE: To examine choroidal thickness and area in healthy eyes using spectral-domain optical coherence tomography (SD-OCT). DESIGN: Retrospective, observational case series. METHODS: Thirty-four eyes (34 subjects), with no retinal or choroidal disease, underwent high-definition raster scanning using SD-OCT with frame enhancement software. Choroidal thickness was measured from the posterior edge of the retinal pigment epithelium to the choroid/sclera junction at 500-mu m intervals up to 2500 pm temporal and nasal to the fovea. The central 1-mm area of the choroid was also measured, along with foveal thickness of the retina. All measurements were performed by 2 independent observers. Statistical analysis was used to correlate inter-observer findings, choroidal thickness and area measurements with age, and choroidal thickness with retinal foveal thickness. RESULTS: The 34 subjects had a mean age of 51.1 years. Reliable measurements of choroidal thickness were obtainable in 74% of eyes examined. Choroidal thickness and area measurements had strong inter-observer correlation (r = 0.92, P < .0001 and r = 0.93, P < .0001 respectively). Area had a moderate negative correlation with age (r = -0.62, P < .0001) that was comparable to the correlation between mean subfoveal choroidal thickness and age (r = -0.61, P < .0001). Retinal and choroidal thickness were found to be poorly correlated (r = -0.23, P = .18). Mean choroidal thickness showed a pattern of thinnest choroid nasally, thickening in the subfoveal region, and then thinning again temporally. Mean subfoveal choroidal thickness was found to be 272 mu m (SD, 81 mu m). CONCLUSIONS: Choroidal thickness can be measured using SD-OCT high-definition raster scans in the majority of eyes. Choroidal thickness across the macula demonstrates a thin choroid nasally, thickest subfoveally, and again thinner temporally, and a trend toward decreasing choroidal thickness with age. (Am J Ophthalmol 2010; 150:325-329. (C) 2010 by Elsevier Inc. All rights reserved.)
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