TWO CASES OF VISIBLE EMBOLI IN RETINAL ARTERIES With a Histological Study in one case

IN view of their rarity it seemed worth while recordinig the o'phthal-moscopic appearances of two-cases in which actual emboli could be seen in retinal arteries. Subsidiary matters of interest were the reactions of neighbouring vessels to the emboli and to vasodilator drugs. Horton Hospital, suddenly noticed a complete " blackout " of her left eye.-She rubbed her eye with her hand, and in about two minutes the low~er half of the field of vision began to clear. After about 20 minutes this half of the field was approximately normal; but the upper half was still absent. Next day about p6.50 p.m., her eyes were examined. At that time the R. vision was 6/5 and L.-Vision 6/9. The left pupil reacted sluggishly to li'ght. The retina in the lower hialf was white and opaque. The inferior temporal branch of the central' artery was contracted from the disc to just above the second fork of the vessel. (Fig. 1). The upper branch of the first fork running beneath the 'macula was also in a state of contraction. AtDthe bifurcation of the, second fork (Fig I and. 2) white mass could be seen in the lumen and apparently including the wal of t Nvesel, so that the width of the mass appeared to be a little wider than the cali of the vessel. The artery just above the fork was dilated, as, were also the two branches of the fork for about 1/4 disc breadth below-after that the branches