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Jorge Ruiz-Medrano, Ignacio Flores-Moreno, Javier A Montero, Jose M Ruiz-Moreno; Temporal choroidal hump in the Swept-Source OCT choroidal thickness profile of a healthy population.. Invest. Ophthalmol. Vis. Sci. 2015;56(7 ):5287.
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© ARVO (1962-2015); The Authors (2016-present)
The choroid and its involvement in a variety of ocular pathologies has been the subject of intensive study during the last few years. The purpose of this study is to describe choroidal thickening temporal to the fovea in the horizontal macular choroidal thickness (CT) profile in a healthy population using swept-source optical coherence tomography (SS-OCT).
Cross-sectional, non-interventional study. 276 eyes from 154 healthy patients, with spherical equivalent (SE) ±3D were scanned using a SS-OCT (Topcon Corporation, Japan). The presence of choroidal thickening (hump) in the analysis of the horizontal macular CT profile was recorded and the distance to the fovea and CT was manually measured. The hump was defined as an evident choroidal thickening compared to the two adjacent measured points by SS-OCT without any other relevant choroidal finding.
Choroidal hump was found in 36 eyes (12.8%). All the humps were found in the temporal sector, with a mean distance to the fovea of 4427.3±627.9 µm (range 2531 to 5492) with a mean hump CT of 372.1±76.8 µm (range 168 to 538). Mean age of the patients with hump was 16±19 years (range 4 to 82) vs. 36±25 years (range 3 to 95) in the patients without hump (p=0.000; Student t test for unpaired data). A thicker temporal CT was noted in the hump group.
Temporal choroidal humps can be considered normal variations without clinical significance. This focal increase in temporal CT is more frequent in younger patients, and it can be explained by the reduced scleral stiffness in younger age and the traction applied by the insertion of the inferior oblique muscle.
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