SUMMARYThe scanning angiographic microscope (SAM) provides a solution to the considerable technical difficulties associated with conventional episcleral Buorescein angiography. Standardised anterior segment fluores cein videoangiograms were performed using the SAM in each episcleral quadrant of the right eye in 6 normal subjects; frame-by-fram� analysis proved important. The blood supply to the anterior segmentl-3 is derived from two circulations, one external to the eye and one with an intraocular route. The external circulation comprises the anterior ciliary arteries, which are continuations of the muscular arteries of the rectus muscles. The anterior ciliary arteries emerge from the rectus muscles posterior to the transition kom muscle to tendon,4 and run forward along the tendon before dividing within the episcleral tissues into branches5 that supply an extensive
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