THE OPTICAL COMPLICATIONS FOLLWOING PENETIIATING KEIIATOPLASTY

Abstract

Corneal diseased patients have only one chance of obtaining a clear v\sion through performing, keratoplasty. Although it is done to replace' optically imperfect host tissue, it is associated with high

degr. ee '

f postoperative astigmatism, myopia, and hyperopia.

T' he success rate of keratoplasty operations may reach up to

95% iq good prognosis cases. Unfortunately, post keratoplasty optical i defects pan prevent good visual function in an eye with a clear graft.

Ii is found that, donor, recipient tissues and surgical techniques play a .contributing role in the final postoperative refractive changes. The donor tissue factors include age, size of the donor grail and I disparity between donor and host tissue sizes. Recipient tissue factors

include: thickness and health of the recipient bed. Whereas, surgical i techniq 1es include corneal trephination (type of trephine, centration,

positim ing) and suturing techniques (different methods and suture materials).

l'pst-keratoplasty astigmatism is the commonest and the most I difficult problem confronting the corneal surgeons, which may reach up to sp. The best way to manage it is by screening of donor tissue; preoperative topographical analysis of the recipient's cornea, using the

best trephine and proper suturing technique. This should be coupled

with intra and postoperative i suture removal. i I

keratoscopy for suture adjustment and