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Proceedings Paper

Corneal haze induced by excimer laser photoablation in rabbits is reduced by preserved human amniotic membrane graft
Author(s): Ming X. Wang; Trevor Gray; Pinnita Prabhasawat; Xiong Ma; William Culbertson; Richard Forster; Khalil Hanna; Scheffer C. G. Tseng
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Paper Abstract

We conducted a study to determine if preserved human amniotic membrane can reduce corneal haze induced by excimer laser photoablation. Excimer photoablation was performed bilaterally on 40 New Zealand white rabbits with a 6 mm ablation zone and 120 micrometer depth (PTK) using the VISX Star. One eye was randomly covered with a preserved human amniotic membrane and secured using four interrupted 10 - 0 nylon sutures; the other eye served as control. The amniotic membranes were removed at one week, and the corneal haze was graded with a slit-lamp biomicroscopy by three masked corneal specialists (WC, KH and RF) biweekly for the ensuing 12 weeks. Histology and in situ TUNEL staining (for fragmented DNA as an index for apoptosis) was performed at days 1, 3 and 7 and at 12 weeks. One week after excimer photoablation, the amniotic membrane-covered corneas showed more anterior stromal edema, which resolved at the second week. A consistent grading of organized reticular corneal haze was noted among the three masked observers. Such corneal haze peaked at the seventh week in both groups. The amniotic membrane-covered group showed statistically significant less corneal haze (0.50 plus or minus 0.15) than the control groups (1.25 plus or minus 0.35) (p less than 0.001). The amniotic membrane-covered corneas had less inflammatory response at days 1 and 3, showing nearly nil DNA fragmentation on keratocytes on the ablated anterior stromal and less stromal fibroblast activation. There is less altered epithelial cell morphology and less epithelial hyperplasia at 1 week in these amniotic membrane-treated eyes. We concluded from this study that amniotic membrane matrix is effective in reducing corneal haze induced by excimer photoablation in rabbits and may have clinical applications.

Paper Details

Date Published: 1 June 1998
PDF: 11 pages
Proc. SPIE 3246, Ophthalmic Technologies VIII, (1 June 1998); doi: 10.1117/12.309422
Show Author Affiliations
Ming X. Wang, Vanderbilt Univ. School of Medicine (United States)
Trevor Gray, Univ. of Miami School of Medicine and Bascom Palmer Eye Institute/Univ. of Miami School of (United States)
Pinnita Prabhasawat, Univ. of Miami School of Medicine and Bascom Palmer Eye Institute/Univ. of Miami School of (United States)
Xiong Ma, Univ. of Miami School of Medicine and Bascom Palmer Eye Institute/Univ. of Miami School of (United States)
William Culbertson, Univ. of Miami School of Medicine and Bascom Palmer Eye Institute/Univ. of Miami School of (United States)
Richard Forster, Univ. of Miami School of Medicine and Bascom Palmer Eye Institute/Univ. of Miami School of (United States)
Khalil Hanna, Univ. of Miami School of Medicine and Bascom Palmer Eye Institute/Univ. of Miami School of (United States)
Scheffer C. G. Tseng, Univ. of Miami School of Medicine and Bascom Palmer Eye Institute/Univ. of Miami School of (United States)


Published in SPIE Proceedings Vol. 3246:
Ophthalmic Technologies VIII
Pascal O. Rol; Karen Margaret Joos; Fabrice Manns, Editor(s)

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