What causes the whites of the eyes to appear blue?

Blue discoloration of the whites of the eyes may be caused by various factors. Genetic predisposition is one possible cause—if family members have this trait, relatives may inherit it. Deficiencies in vitamins such as B12 and C can also lead to bluish whites of the eyes, as these vitamins are essential for eye health; their deficiency may result in insufficient pigmentation of the sclera. Certain medical conditions, including scleritis, hypertension, and diabetes, may also cause a blue tint in the whites of the eyes, potentially due to their effects on retinal blood vessels or other ocular abnormalities. Physiological factors, such as a thinner-than-normal eyeball wall or thin sclera, may allow underlying blood vessels to show through, making the whites of the eyes appear bluer. Given that multiple factors can contribute to this condition, individuals experiencing this symptom should seek timely medical evaluation to determine the underlying cause and receive appropriate treatment.