Abstract
Purpose
To evaluate the relationship between contrast sensitivity (CS) and widefield swept–source optical coherence tomography angiography (WF SS-OCTA) vascular metrics in diabetic macular edema (DME) was the purpose.
Methods
This prospectively enrolled cross-sectional observational study included 61 eyes of 48 patients that were tested with the quantitative CS function (qCSF) test on the same day as imaging with WF SS-OCTA (PLEX® Elite 9000, Carl Zeiss Meditec) 3 × 3, 6 × 6, and 12 × 12 mm scans. Outcomes included visual acuity (VA) and multiple qCSF metrics. Vascular metrics included vessel density (VD) and vessel skeletonized density (VSD) in the superficial (SCP) and deep capillary plexus (DCP) and whole retina (WR) and foveal avascular zone (FAZ) parameters. Mixed effects multivariable linear regression models controlling for age, lens status, and diabetic retinopathy stage were performed. Standardized beta coefficients were calculated by refitting the standardized data.
Results
SS-OCTA metrics had a significant association with CS and VA. The effect size of OCTA metrics was larger on CS compared to VA. For example, the standardized beta coefficients for VSD and CS at 3 cpd (βSCP = 0.76, βDCP = 0.71, βWR = 0.72, p < 0.001) were larger than those for VA (βSCP = − 0.55, p < 0.001; βDCP = − 0.43, p = 0.004; βWR = − 0.50, p < 0.001). On 6 × 6 mm images, AULCSF, CS at 3 cpd, and CS at 6 cpd were significantly associated with VD and VSD in all three slab types (SCP, DCP, and WR), while VA was not.
Conclusion
Structure–function associations in patients with DME leveraging the qCSF device suggest microvascular changes on WF SS-OCTA are associated with larger changes in contrast sensitivity than VA.
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Data availability
Data are available upon reasonable request. Deidentified participant data, protocols, and statistical analysis are available from the corresponding author (ORCID ID: 0000–0003-0109–9738).
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Acknowledgements
The authors would like to thank all the staff for their help and assistance in research and patient recruitment from retina clinics at Massachusetts Eye and Ear, and Yan Zhao for her help with statistical analysis.
Funding
Lions International Fund (Grant 530125 and 530869).
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Concept and design: GB, FV, LAK, TE, DH, and JBM. Data collection: GB, FV, IG, JYM, RZ, YC, RK, RL, ESL, DNS, and ZH. Original manuscript draft: GB and FV. Critical revision of the manuscript: GB, FV, IG, JYM, RZ, YC, RK, RL, ESL, DNS, ZH, DNS, LAK, TE, DH, and JBM. Guarantors: GB, FV, and JBM.
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The study was conducted in accordance with the tenets set forth in the Declaration of Helsinki and all necessary authorizations were obtained from the MEE Institutional Review Board (Protocol #: 2019P001863).
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Written informed consent was obtained from all participants prior to the inclusion in this study.
Competing interest
L.A.K. has received research support from the National Eye Institute (R01EY027739), CureVac AG, and INGENIA Therapeutics and has a financial arrangement with Pykus Therapeutics. D.H. is a consultant for Allergen, Genentech, and Omeicos Therapeutics and has received financial support from National Eye Institute, Lions VisionGift, Commonwealth Grant, Lions International, Syneos LLC, and the Macular Society. J.B.M. is a consultant for Alcon, Allergan, Topcon, Carl Zeiss, Sunovion, and Genentech.
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Baldwin, G., Vingopoulos, F., Garg, I. et al. Structure–function associations between contrast sensitivity and widefield swept–source optical coherence tomography angiography in diabetic macular edema. Graefes Arch Clin Exp Ophthalmol 261, 3113–3124 (2023). https://doi.org/10.1007/s00417-023-06086-1
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DOI: https://doi.org/10.1007/s00417-023-06086-1