Determinants of retinal venular diameter: the Beaver Dam Eye Study.
OBJECTIVE
To describe how retinal venular diameter changes over time for an individual and to examine differences in these changes among people with different risk profiles.


METHODS
Population-based cohort study.


METHODS
A total of 4600 persons aged 43 to 86 years from the Beaver Dam Eye Study (BDES) who participated in at least 1 examination and had venular diameter measured in the right eye.


METHODS
Data from 4 examinations during a 15-year period were analyzed. Retinal venular diameter was measured from photographs at each examination by computer-assisted methods and summarized as the central retinal venular equivalent (CRVE). Associations of risk factors with concurrent CRVE measurements and changes in CRVE over time were determined using multivariate analyses.


METHODS
Central retinal venular equivalent.


RESULTS
The CRVE tended to narrow with age. Mean CRVE was approximately 5 μm smaller (225 vs. 230 μm) for the average 70-year-old compared with the average 50-year-old, and was approximately 13 μm smaller (217 vs. 230 μm) for the average 85-year-old compared with the average 50-year-old. Male sex (beta estimate [β] = 5.24; 95% confidence interval [CI], 3.58-6.90), history of current cigarette smoking (β = 9.38; 95% CI, 8.26-10.49), and higher white blood cell (WBC) count (per 1000/μL: β = 0.95; 95% CI, 0.74-1.16) were independently associated with larger concurrent CRVE, whereas higher mean arterial blood pressure (per 5 mmHg: β = -0.36; 95% CI, -0.50 to -0.23) and higher serum high-density lipoprotein (HDL) cholesterol (per 10 mg/dl: β = 0.89; 95% CI, -1.15 to -0.63) were independently associated with smaller concurrent CRVE. History of cardiovascular disease (CVD) (β = -0.16; 95% CI, -0.26 to -0.06) and presence of chronic kidney disease (CKD) (β = -0.20; 95% CI, -0.34 to -0.05) were associated with a greater decrease in CRVE over time.


CONCLUSIONS
These data show that retinal venular diameter tends to narrow with age; concurrent venular diameter is independently associated with sex, blood pressure, serum HDL cholesterol, WBC count, and history of current cigarette smoking; and change in CRVE is independently associated with a history of CVD and presence of CKD. The different independent effects of these interrelated factors on CRVE highlight the complex relationship between CRVE and systemic diseases and conditions and the difficulty in determining specific causes of change in CRVE over time.


BACKGROUND
The author(s) have no proprietary or commercial interest in any materials discussed in this article.
Department of Ophthalmology and Visual Sciences, University of Wisconsin School of Medicine and Public Health, Madison, Wisconsin 53726, USA. myers@epi.ophth.wisc.edu
Chelsea E
CE
Myers
Ronald
R
Klein
Michael D
MD
Knudtson
Kristine E
KE
Lee
Ronald
R
Gangnon
Tien Y
TY
Wong
Barbara E K
BE
Klein
D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000375:Aging / Q000502:physiology*; D001794:Blood Pressure / Q000502:physiology*; D002318:Cardiovascular Diseases / Q000503:physiopathology*; D008076:Cholesterol, HDL / Q000097:blood*; D015331:Cohort Studies; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D006973:Hypertension / Q000503:physiopathology; D007091:Image Processing, Computer-Assisted; D007674:Kidney Diseases / Q000503:physiopathology*; D007958:Leukocyte Count; D008297:Male; D008875:Middle Aged; D012169:Retinal Vein / Q000473:pathology*; D012737:Sex Factors; D012907:Smoking / Q000503:physiopathology*; D011795:Surveys and Questionnaires; D014699:Venules / Q000473:pathology; D014922:Wisconsin
D008076:Cholesterol, HDL