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