>120° OCT Angiography (non-invasive) image of a PDR eye (Fig1). Scattered microaneurysms, NPA and IRMA. Severe non-perfusion in the nasal side of the optic disc, which is important for treatment reference, where could be missed by most traditional OCTA or FAG. A "sun-glass" shaped shadow in macular indicates preretinal hemorrhage with typical horizontal liquid upper level.

Fig2 presents a 24mm length B-scan across macular and disc. In addition to edema and exudate, three spots of hemorrhage can be visualized as well.

Choroid flow segmentation (Fig3) shows vortex veins at four corners from just a 2x montage of a single 24mm OCTA. Preretinal hemorrhage also cast a shadow on this image. Opposite to retina condition, no significant flow void was found indicating DR is a pathology that involves more retinal circulation.

Interestingly, when the segmentation is switched to vitreous level (Fig4). All NVE (retinal neovascularization) are so highlighted as they are being displayed independently. What an easy way to identify NVE from such a wonderful image modality!

Acquisition time of each capture (24mm OCTA) is only within 15 seconds, by 400KHz SS-OCT/OCTA system BMizar from TowardPi.

“Thank TowardPi for contributing such powerful OCT to global ophthalmologists, exceptional performance in all respects, posterior and anterior!”. Endorsed by Prof. Haifeng Xu.

Author:

Prof. Haifeng Xu (Qingdao Eye Hospital of Shandong First Medical University, China)

Dr. Jian Zhou (TowardPi)