Quantitative Analysis of the Vasculature and Cone Photoreceptors in Subjects With Diabetes Without Diabetic Retinopathy

To characterize any differences in the vasculature and cone photoreceptor packing geometry (CPG) between subjects with diabetes without/no diabetic retinopathy (NDR) and healthy controls. Eight NDR and five controls were enrolled. Optical coherence tomography angiography (OCTA) taken at the macula w...

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Bibliographic Details
Published in:Current eye research 2024-06, Vol.49 (6), p.650-662
Main Authors: Johnson, Danae A, Doble, Nathan, Choi, Stacey S
Format: Article
Language:English
Subjects:
Adult
Aged
Diabetic Retinopathy - diagnosis
Diabetic Retinopathy - physiopathology
Female
Fluorescein Angiography - methods
Fundus Oculi
Humans
Macula Lutea - pathology
Male
Middle Aged
Ophthalmoscopy
Retinal Cone Photoreceptor Cells - pathology
Retinal Vessels - diagnostic imaging
Retinal Vessels - pathology
Retinal Vessels - physiopathology
Tomography, Optical Coherence - methods
Visual Acuity - physiology
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Summary:To characterize any differences in the vasculature and cone photoreceptor packing geometry (CPG) between subjects with diabetes without/no diabetic retinopathy (NDR) and healthy controls. Eight NDR and five controls were enrolled. Optical coherence tomography angiography (OCTA) taken at the macula was used to measure vessel density, vessel length density, and vessel density index (VDI) in three vascular plexuses, namely, the superficial vascular plexus, intermediate capillary plexus, and deep capillary plexus (DCP). The choriocapillaris (CC) flow deficit (FD) was also measured. OCTA images were binarized and processed to extrapolate the parafovea and parafoveal quadrants and the OCTA indices mentioned above. The CC was processed with six different radii to quantify FD. Adaptive optics - scanning laser ophthalmoscopy images were acquired and processed to extract CPG indices, i.e., cone density (CD), cone-to-cone spacing (CS), linear dispersion index, heterogeneity packing index and percent of cells with six neighbors at 3.6° in the temporal retina. In all eyes, statistically significant differences were found (i) in parafoveal FD across the six radii (  
ISSN:0271-3683
1460-2202
DOI:10.1080/02713683.2024.2320787