The major systemic determinant of narrower retinal arteriolar caliber is higher blood pressure, while those of wider retinal venular caliber are cigarette smoking, higher blood pressure, systemic inflammation, and obesity. These data offer further insights into the systemic processes influencing arteriolar and venular characteristics and may help explain the observed associations of retinal vascular caliber and the risk of clinical cardiovascular disease.
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Gerald Liew (2008) studied this question.
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