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Proceedings Paper

Mathematical model of annular keratophakia: intracorneal ring and gel injection adjustable keratoplasty
Author(s): Jean-Marie A. Parel; Jason I. Comander; Gabriel Simon; Yoshiko Takesue M.D.; Franck L. Villain
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Paper Abstract

Over the past century, several refractive surgical techniques have been devised to correct ametropia. These can be categorized in three difterent ways: (I) The first is the "subtraction" method, consisting in the removal of tissue from the patient's cornea1 . Removal is almost always performed on the central optical zone. Mechanical instruments or photoablative lasers are used for these procedures. Today, the ArF I 93nm excimer and, potentially, the 21 3nm frequency quintupled Nd:YAG solid state lasers have replaced the keratomileusis mechanical techniques originally developed by José I. Barraquer; (II) The second is the Nadditivew method, involving the implantation of donor tissue or a polymeric implant in the host corneal stroma1 or under the host comeal epithelium2. One subclassification of the second method consists of implanting a lenticule over the central optical zone while the others rely on bending the host peripheral cornea either using a ring implant; (Ill) The third method consists of thermal shrinking portions of the stromal collagen at difterent locations on the cornea to correct myopia, hyperopia, or astigmatism. Several kinds of heat sources have been investigated, including hot wires cautery and RF diathermy, but the mid-infrared lasers have given the best clinical results thus fare.

Paper Details

Date Published: 23 June 1994
PDF: 10 pages
Proc. SPIE 2126, Ophthalmic Technologies IV, (23 June 1994); doi: 10.1117/12.178573
Show Author Affiliations
Jean-Marie A. Parel, Hopital de l'Hotel-Dieu/Univ. de Paris and Bascom Palmer Eye Inst./Univ. of Miami School of Medicine (United States)
Jason I. Comander, Bascom Palmer Eye Institute/Univ. of Miami School of Medicine and Harvard Univ. (United States)
Gabriel Simon, Univ. of Miami School of Medicine (United States)
Yoshiko Takesue M.D., Bascom Palmer Eye Institute/Univ. of Miami School of Medicine and Fukuoka Univ. School of Medicine (Japan)
Franck L. Villain, Bascom Palmer Eye Institute/Univ. of Miami School of Medicine (United States)

Published in SPIE Proceedings Vol. 2126:
Ophthalmic Technologies IV
Jean-Marie A. Parel; Qiushi Ren, Editor(s)

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