| http://www.w3.org/ns/prov#value | - As the retraction member 20 is made of shape memory material, the incision 18 in the cornea 15 for insertion of the retraction member 20 can be implemented by a suitable surgical instrument, e.g. scalpel or knife or the like, of a width of only about 0.2 mm to 0.4 mm.
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