_Third step._ The cut margin of the tarsal plate is sutured to the
levator palpebræ and palpebral ligament by two sutures passed in the
following manner: A thick catgut suture armed with a curved needle is
passed through the upper cut margin of the orbicularis palpebrarum,
palpebral ligament, and levator palpebræ (if the latter be present) at
about the junction of the middle and inner thirds of the wound, a firm
hold being taken on these structures. The needle is then passed through
the tarsal cartilage parallel to the lid border for a distance of about
3 millimetres and out again on to its anterior surface. The needle is
then again carried through the levator palpebræ, palpebral ligament, and
orbicularis in the upper part of the wound. A similar suture is passed
about the junction of the middle and outer thirds of the wound. When
both sutures are in position they are tied sufficiently tightly to
produce the retraction of the lid desired, slight over-correction being
necessary. The skin wound is then closed with sutures.
ATTACHMENT OF THE LID TO THE OCCIPITO-FRONTALIS MUSCLE
There are three chief methods of affecting this attachment:--
(_a_) By cicatricial bands (_e.g._ Hess’s operation).
(_b_) By a suture left permanently in position (_e.g._ Harman’s
operation).
(_c_) By the attachment of the skin of the lid to the muscle (_e.g._
Panas’ operation).
=Indications.= In the majority of the cases of congenital ptosis the
levator palpebræ is completely absent, as shown by the want of upward
movement in the lid, and it is for this condition that one of the
operations of this type is performed. In rare cases the
occipito-frontalis muscle is also absent or imperfectly developed, and
in these cases these operations should not be undertaken.
=Hess’s operation.= The object of this operation is to insert silk
stitches between the eyelid and the occipito-frontalis muscle, and to
leave them in long enough for a fibrous band of union to form along the
stitch tracks.
=Instruments.= Scalpel, dissecting forceps, needle and holder, spatula,
artery forceps.
=Operation.= _First step._ The eyebrow having been shaved, an incision 2
inches long is made about in the line of the brow, and the skin is
dissected down almost to the lid margin.
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