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The light streak on retinal vessels
Author(s) -
BrinchmannHansen Olaf,
Engvold O.
Publication year - 1986
Publication title -
acta ophthalmologica
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.534
H-Index - 87
eISSN - 1755-3768
pISSN - 1755-375X
DOI - 10.1111/j.1755-3768.1986.tb00703.x
Subject(s) - streak , retinal , optics , tilt (camera) , blood flow , reflection (computer programming) , ophthalmoscopy , streak camera , refraction , light intensity , retina , anatomy , physics , geometry , ophthalmology , medicine , mathematics , laser , computer science , programming language
By ophthalmoscopy, a bright light streak is seen in the center of retinal vessels, and the intensity of this reflection (I r ) is found to be different for arteries and veins. Various physical parameters affect this reflection, and the present study analyses, on a theoretical basis, possible explanations of the variability of the light streak on different types of vessels. Parameters found to influence I r are the roughness of the surface of the blood column, the indices of refraction of erythrocytes and plasma, the size of the pupil, the axial length of the eye and the tilt of the blood vessel relative to the direction of incident light. Numerical analysis of a simplified model of retinal vessel geometry and blood flow enable us to present relations between relative intensity and the various parameters.