Relationship between vascular densities of choriocapillaris and the whole choroid using OCTA
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ORIGINAL PAPER
Relationship between vascular densities of choriocapillaris and the whole choroid using OCTA Francisco de Ası´s Bartol-Puyal . Carlos Isanta . Pilar Calvo . ´ scar Ruiz-Moreno . Luis Pablo O
Received: 28 April 2020 / Accepted: 25 June 2020 Ó Springer Nature B.V. 2020
Abstract Purpose To study the vascular density (VD) of choriocapillaris and the whole choroid using optical coherence tomography-angiography (OCTA). Methods Cross-sectional study enrolling healthy individuals between 18 and 35 years old and with an axial length (AL) lower than 26 mm, who were examined with swept-source OCTA Triton DRI (Topcon). Color pictures of both VD were obtained from a fovea-centered 6 9 6 mm macular exam, which were divided into 900 squares and codified into numbers. Results A total of 50 patients (100 eyes) with a mean age of 27.29 ± 3.90 years and a mean AL of 23.67 ± 0.74 mm were analyzed. The highest choroidal VD was found in juxtapapillary macula, being
Francisco de Ası´s Bartol-Puyal (&) ´ . Ruiz-Moreno L. Pablo P. Calvo O Ophthalmology department, Miguel Servet University Hospital, Paseo Isabel la Cato´lica, 1-3, 50009 Zaragoza, Spain e-mail: [email protected] Francisco de Ası´sBartol-Puyal C. Isanta ´ . Ruiz-Moreno L. Pablo P. Calvo O Ophthalmology Innovative and Research Group (GIMSO), Arago´n Institute for Health Research (IIS Arago´n), Zaragoza, Spain ´ . Ruiz-Moreno Francisco de Ası´sBartol-Puyal O L. Pablo University of Zaragoza, Zaragoza, Spain
followed by the most temporal macula and fovea. The lowest was found in superior and inferior perifoveal areas. The highest VD in choriocapillaris was in the fovea. VD in this layer was uniform, with a decrease from temporal toward nasal. Both VD differed and but correlated, especially in the fovea and in inferiortemporal macula. Conclusion VD of choriocapillaris and the whole choroid are not similar. The former is maximal in the fovea, and the latter is maximal in the juxtapapillary macula. In general lines, choroidal VD is higher than that of choriocapillaris. Both VD are directly correlated. Keywords Choriocapillaris Choroid Optical coherence tomography-angiography Threedimensional map Vascular density
Introduction Optical coherence tomography-angiography (OCTA) is a recent technological device detecting ocular blood circulation and creating en-face vascularity images without an intravenous contrast agent. It allows analyzing the distribution of vessels in every retinal layer and in choroid [1], although Sattler and Haller’s layers have not been automatically delimited yet. Choroid is the deepest analyzed ocular layer, and that is why the new generation of OCT called swept-
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source OCT (SS-OCT) was developed, which uses a wavelength of 1050 nm and is in fact much more adequate than the previous models for visualizing choroid [2]. Some others added different modules, like Spectralis (Heidelberg Engineering Inc., Heidelberg, Germany) with its enhanced-de
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