By beveled, what is meant is that the distal end surface of the optic fiber and the distal, annular end surface of the cannula are both formed at an oblique angle to {HEAD ~ the center axes} of {TAIL ~ the cannula} and the portion of the optic fiber passing through the cannula 
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By beveled , what is meant is that the distal end surface of the optic fiber and the distal , annular end surface of the cannula are both formed at an oblique angle to { HEAD ~ the center axes } of { TAIL ~ the cannula } and the portion of the optic fiber passing through the cannula
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