Analyzing foveal slope and retinal thickness in diabetics and healthy individuals with and without diabetic family history in South India for early neuronal damage prediction

Abstract

Purpose: The purpose of this study was to investigate whether the clinically “healthy subjects,” identified as being at “risk” of developing diabetes, show significant changes in retinal thickness using optical coherence tomography(OCT) and foveal slope patterns. Methods: A cross-sectional, comparative study was conducted among the subjects who attended the hospital from December 2022 to April 2023. Subjects were included after obtaining written informed consent and were divided into three groups: Type 2 DM, healthy subjects with a family history (high-risk group), and those without a family history of diabetes. Foveal, parafoveal, and perifoveal thicknesses were measured using OCT. The fovea slope pattern was calculated using Image J software. Descriptive statistics, Pearson correlation, and ANOVA were performed for statistical analysis. Results: The study group had a mean age of 45.7 years, 95% of whom were female. The mean central foveal thickness (CFT) for the three groups was (CFTDM: 270 ± 33 μm; CFT FHD+: 254±19.6 μm; CFTFHD−: 255.4 ±19.2 μm; P = 0.118). The mean AUC (ILM-RPE) for (DM: 94577 ± 118905) pixel2 was significantly different from healthy control (FHD−:183705 ±156139 pixel2; P = 0.030) but was insignificant (P = 1.000) from subjects with family history (FHD+: 112749 ± 130451 pixel2). Males with diabetes had a greater foveal thickness than females (male: 277.8 ± 39.5 μm vs. female: 242.0 ± 41.7 μm, P = 0.05); however, no significant gender disparity was reported in the foveal slope. Conclusion: Decreased ILM-RPE thickness and foveal configuration were identified in subjects with family histories who do not meet the clinical criteria of diabetes but showed trends similar to diabetics.