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Eduardo Novais, Emmerson Badaró, Norma Allemann, Eduardo Rodrigues, Rodrigo Lima, Caio Regatieri, Rubens Belfort, Jr.; Correlation between choroidal thickness and choroidal blood flow in normal subjects. Invest. Ophthalmol. Vis. Sci. 2014;55(13):639.
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© ARVO (1962-2015); The Authors (2016-present)
To investigate the correlation between choroidal thickness (CT) measured by spectral domain optical coherence tomography (SD-OCT) and the retrobulbar circulation measured by color Doppler flowmetry (CD) in normal subjects
Fifty-four eyes of 27 healthy patients, mean age 40.6 ± 12.4 years (range 27 to 68 year-old) were submitted to enhanced depth imaging SD-OCT(Spectralis OCT, Heidelberg Engineering, Germany) and CD using a linear 6-18 MHz transducer (MyLab30, Esaote, Italy). Maximum peak systolic velocity (VSM) and resistance index (RI) were obtained for ophthalmic (OA), short posterior ciliary (SPCA), and central retinal arteries (CRA); and correlated to subfoveal CT measurements measured by SD-OCT (Spectralis, Heidelberg Engeenering)
An inversely proportional relationship was present between the SPCA resistance index (mean= 0.611± 0.07) and subfoveal CT (319.9 ± 83.7 μm), p= 0.0496, which was not found for the OA (mean= 0.701 ± 0.07) or the CRA (mean= 0.688 ± 0.08). There was no significant difference between CT values in both eyes (p= 0.5476)
Our results suggest that there is an inversely proportional relationship between the resistance index of the SPCA and the subfoveal CT. It was found an evidence that there is a decrease of CT with an increased resistance index in the retrobulbar arteries. Therefore a lower blood flow in the choroid can possibly explain the reduced CT in normal subjects
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