Eye Axial Length: Is There a Protective Link to Diabetic Retinopathy?

Diabetic retinopathy (DR) is a leading cause of vision impairment and blindness globally, particularly among working-age adults. As the prevalence of diabetes continues to rise, understanding factors that influence DR development and progression is increasingly important. Recent studies suggest a protective association between a longer axial length (AL) of the eye and the risk of DR, particularly in myopic individuals. This review explores the potential mechanisms underlying this relationship, including reduced retinal vascular density, altered retinal blood flow, and ocular biomechanics, which may collectively reduce the susceptibility of retinal tissues to hyperglycemic damage. However, limitations such as confounding factors, ethnic and genetic differences, and methodological challenges highlight the need for further research. This review aims to explore the relationship between AL and DR, examining the biological mechanisms that may underpin this association, summarizing the epidemiological evidence, discussing the clinical implications, and identifying directions for future research. Understanding the protective role of AL could have significant clinical suggestions, including more tailored screening intervals and personalized treatment approaches for DR. Future studies should focus on longitudinal analyses, mechanistic insights, and diverse populations to establish a clearer understanding of this relationship and its potential for novel therapeutic strategies.