This name is employed to designate a triangular conjunctival fold
broader at its sclerotic end and gradually narrowing to its corneal
extremity, with loose, slightly overlapping borders, and firmly fixed to
the structures beneath. It is more vascular than the surrounding
conjunctiva, and its comparatively large blood-vessels have suggested
the veins of an insect’s wing—hence its name. The growth may extend from
either canthus toward or partly over, the cornea.
Möller and Leclainche claim its existence in dogs, though rarely to such
an extent as to demand surgical interference. Dunewald operated on a
case in the cow.
Unless growing, it need not be interfered with. It may be dissected up
with scissors the narrow end being dragged on by forceps. Another method
is to cauterize the narrow end with the electric cautery which leads to
material contraction of the entire mass.