Fig 1.
Swept-source optical coherence tomography angiography (SS-OCTA) and fluorescein angiography (FA) images of a representative eye with diabetic retinopathy.
Extended field imaging (EFI) SS-OCTA (A and B),12 mm x 12 mm SS-OCTA without EFI (C and D), FA with 55 degrees lens (E and F), the corresponding binarized images (G and H) and fractal dimension images (I and L). White dot line delimits the areas of non-perfusion.
Table 1.
Demographic features.
Fig 2.
Fluorescein angiography (FA) and SS-OCTA images of one representative eye with diabetic retinopathy.
SS-OCTA performed with the EFI technique (A) with the white circle indicating the field of view of FA obtained with the standard Heidelberg 55 degrees lens (B) and white square indicating the field of view of SS-OCTA without EFI (C). The vitreoretinal interface segmentation (D) reveals the new blood vessels in the vitreous cavity.
Fig 3.
Swept-source optical coherence tomography angiography (SS-OCTA) and fluorescein angiography (FA) images of one representative eye with retinal vein occlusion.
SS-OCTA without and with EFI (A and B) showing a similar distribution of non-perfused areas but not corresponding to FA (C). Interestingly, OCTA images display an interrupted vessel (white arrow) whereas FA apparently displays a complete filling of the same vascular trunk (white arrow). The analysis of FA early phases revealed slow but compete filling suggesting that the velocity of blood flow influences the OCTA signal thus possibly leading to an over estimation of non-perfusion.