August 1974
Volume 13, Issue 8
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Articles  |   August 1974
A Model of Anisotropic Factors Contributing to Retinal Venous Nicking
Author Affiliations
  • B. CARROLL SMILEY
    Division of Ophthalmology, Department of Surgery, College of Medicine and the Wenner-Gren Laboratory, College of Engineering, University of Kentucky, Lexington, Ky.
  • JONATHAN D. WIRTSCHAFTER
    Division of Ophthalmology, Department of Surgery, College of Medicine and the Wenner-Gren Laboratory, College of Engineering, University of Kentucky, Lexington, Ky.
  • JAMES F. LAFFERTY
    Division of Ophthalmology, Department of Surgery, College of Medicine and the Wenner-Gren Laboratory, College of Engineering, University of Kentucky, Lexington, Ky.
Investigative Ophthalmology & Visual Science August 1974, Vol.13, 629-633. doi:
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      B. CARROLL SMILEY, JONATHAN D. WIRTSCHAFTER, JAMES F. LAFFERTY; A Model of Anisotropic Factors Contributing to Retinal Venous Nicking. Invest. Ophthalmol. Vis. Sci. 1974;13(8):629-633.

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Abstract

A laboratory model consisting of fluid flow through Penrose tubing arrangements in a pressure chamber was used to explain the "nicking" phenomenon. The effects of various forces possibly at play in the regions of arteriovenous crossings were considered. The triangular or "shark's tooth" shape of the underlying vein observed by investigators can be produced by the forces generated by the movement of a hypertensive artery. The narrowed lumen of the vein and, therefore, the narrowed blood column at the crossings can explain the ophthalmoscopic appearance of "nicking."

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