Effects of Differences in Body Composition on Retina and Choroid

The goal of this observational study is to examine the effects of body composition differences on retinal and choroidal structures. The study aims to investigate how variations in fat distribution and body composition parameters influence ocular microvascular structures. The main questions it aims to answer are: * How do differences in body composition (BMI, waist circumference, bioelectrical impedance parameters) affect retinal and choroidal microvascular structures? * Are there significant structural changes in the retina and choroid among individuals with different body composition profiles? Participants will: * Be classified into five groups based on their Body Mass Index (BMI) (underweight, normal weight, overweight, obese, and severely/morbidly obese). * Undergo detailed body composition analysis using bioelectrical impedance analysis (BIA) to assess fat mass, muscle mass, visceral fat index, and metabolic age. * Receive comprehensive ophthalmologic evaluations, including Optical Coherence Tomography (OCT) and Optical Coherence Tomography Angiography (OCTA), to measure retinal thickness, choroidal thickness, and microvascular parameters. * OCTA images will be analyzed using the OCTAVA software to compute vascular parameters. This study does not involve any new treatments, drugs, or interventional procedures. The findings aim to provide insights into the relationship between body composition and ocular microvascular health, contributing to early detection and prevention strategies for obesity-related ocular complications.