Abstract
The anterior portion of the eye receives arterial blood from two circulations. One circulation is external to the globe—the anterior ciliary arteries; the other is internal to it—the long posterior ciliary arteries. This study determined the percentage contribution to anterior segment blood flow by anterior ciliary arteries in primates by the reference blood flow method using 15±3 μ 103Ru labeled microspheres. Recti muscles were isolated by standard strabismus surgery in both eyes. Next, with one eye serving as a sham-operated control, the fellow eye underwent tenotomy immediately prior to the microsphere injection. The surgical disruption of the external circulation in the experimental eyes significantly reduced ( P < 0·01) blood flow to the anterior segment. Anterior segment blood flow values for the tenotomized eyes (0·11±0·03 ml/min/g) were 70–80% less than the control eye values (0·34±0·07 ml/min/g). Therefore, the majority of blood flow to the primate anterior segment is carried by the anterior ciliary arteries.
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