What is corneal trephine?

What is corneal trephine?

CORNEAL TREPHINES. The word ‘trephine’ refers to a circular or cylindrical saw,4 a surgical instrument for cutting out circular sections, as of corneal tissue or bone.

What is penetrating keratoplasty used for?

Penetrating keratoplasty, or full thickness corneal transplantation, is the surgical procedure most commonly used in management of blinding corneal disease.

What is a Khodadoust line?

The endothelial rejection line (Khodadoust line) is an aggregation of lymphoid cells on the corneal endothelial side and is a sign of immunologic corneal allogenic graft rejection [10], which has been classically described after PKP.

What does the word trephine mean?

: a surgical instrument for cutting out circular sections (as of bone or corneal tissue) trephine. transitive verb. tre·​phine | \ ˈtrē-ˌfīn , tri-ˈ \ trephined; trephining.

What is rotational keratoplasty?

This procedure involves a rotation of the patient’s own cornea to move opacity out of the visual axis and replace it with clear cornea. Modern microsurgical techiques have considerably improved the ease with which this may be done, but success depends on careful pre operative assessment of the patient.

What is the difference between DMEK and Dsek?

DMEK is very similar to DSAEK, with the primary difference being that the donor tissue implanted does not include any stromal tissue, but is instead a pure replacement of endothelium. A DMEK graft, therefore, is much thinner than a DSAEK graft.

How many sutures are in keratoplasty?

Typically 16 sutures are placed, although in large corneal grafts or corneoscleral grafts, additional sutures may be necessary. Suture placement is usually performed to minimize the development of astigmatism, with every other suture being placed 180 degrees away from the previous suture.

How many cornea transplants can a person have?

A corneal transplant can be repeated, usually with good results. However, the overall rejection rates for repeated transplants are slightly higher than for the first transplant.

What is allograft rejection?

Allograft rejection is inflammation with specific pathologic changes in the allograft, due to the recipient’s immune system recognizing the non-self antigen in the allograft, with or without dysfunction of the allograft.

What is bullous keratopathy of the eye?

Bullous keratopathy, also known as oedematous keratopathy, involves a corneal imbalance caused by fluid entering the cornea due to a change in the endothelium, the internal cellular layer.

Which suture used in keratoplasty?

The most common suturing technique for routine penetrating keratoplasty was a single continuous suture (35%). In these cases, a 10/0 nylon suture was used by 89%.

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