Enlargement of the foveal avascular zone (FAZ) due to progressive capillary nonperfusion is associated with visual deterioration in patients with diabetic retinopathy. The FAZ area has long been considered an important clinical marker of advancing retinopathy. However, a large body of literature shows that the FAZ area varies considerably in healthy eyes, resulting in substantial overlap between controls and diabetics, thus reducing its discriminatory value. In this study, within-subject FAZ area enlargement was obtained by the comparison of the structural FAZ area to the functional FAZ area using simultaneouslyacquired, corresponding en face OCT reflectance and OCT angiography images. Our study suggests that en face OCT reflectance images provide useful anatomic baselines of structural FAZ morphology prior to the onset of disease. Measurements of within-subject FAZ area enlargement appear to be a more sensitive method for identifying the onset of diabetic retinopathy as compared to using OCT angiographic measurements of FAZ alone.

Medical education must provide students with a delicate balance of academic rigor, equity, and wellness. While the medical education community espouses all these values, the authors believe the way medical students are evaluated and rewarded undermines equity and wellness. Alpha Omega Alpha Honor Medical Society (AΩA) membership is arguably the highest honor that a medical student can achieve. In the short term, it opens doors to the most selective training opportunities, and in the long term, ushers students into an elite group of future physician leaders. Yet recent data have demonstrated that AΩA is disproportionately awarded to white students. At Icahn School of Medicine at Mount Sinai (ISMMS), the authors observed that students underrepresented in science and medicine were persistently underrepresented among those selected for AΩA. They describe efforts at ISMMS to reduce bias in the selection process and the ultimate decision to suspend medical student selection for AΩA altogether. The authors argue that selection to AΩA reinforces the structural biases and social privilege that are embedded in medical education and undermines the ability to deliver an educational experience that has as its core tenets equity and wellness. Suspending participation in student selection for AΩA is an important step toward recognizing that medical school learning environments continue to privilege white students over students who are underrepresented in medicine.

Background/aimsTo assess foveal avascular zone (FAZ) morphology and parafoveal capillary perfusion in patients with various stages of sickle cell retinopathy (SCR) using optical coherence tomography angiography (OCT-A).MethodsThis is a multi-institutional retrospective study of patients with various stages of SCR compared with healthy controls. Parafoveal OCT-A images obtained using a commercial spectral domain-OCT system were reviewed. Foveal-centred 3×3 mm full vascular slab OCT-As were used for image processing and data analysis. FAZ area, perimeter, and acircularity index were determined on the OCT-A image after manual delineation of the FAZ border. Quadrant-based parafoveal capillary density and per cent area deviating from normal distribution were also measured.ResultsFifty-two patients with SCR (33 non-proliferative and 19 proliferative) and 20 age and race-matched healthy controls were included. One randomly selected eye per study participant was analysed. FAZ perimeter and acircularity index were significantly greater in SCR eyes when compared with the controls. While parafoveal capillary density was significantly lower, per cent area deviated from normal distribution was significantly higher in SCR eyes than that of the control. However, no statistically significant difference between the two SCR stages was observed. In quadrant-based analysis, the temporal quadrant showed greater parafoveal capillary dropout due to SCR, with the most profound effect in patients with proliferative SCR.ConclusionsAbnormal FAZ morphology and altered parafoveal capillary perfusion were found in patients with SCR. Our customised OCT-A image analysis method uniquely highlights significant quantitative alterations in perfusion density mapping in a qualitative display, with minimal obscuration of OCT-A image detail.