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Proceedings Paper

Deep sclerectomy using erbium:YAG laser in pig’s eyes
Author(s): Yehia A. Badr; Ibrahim M. Taher; Mostafa M. Bahgat; Dina F. Ghoneim
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Paper Abstract

The potential benefits of using pulsed Erbium: YAG laser in removing the deep lamella of the sclera during the procedure of deep sclerectomy was studied. Thirty porcine eyes were divided into 3 groups. A superficial lamellar scleral flap with an area of 5x5 mm as for trabeculectomy was surgically prepared. Using an Erbium: YAG laser (2.94 micron), the deep lamella with an area of 3x1.8 mm was removed. Group I was subjected to an energy level of 40-60 m.J, Descemet's membrane was preserved and trabecular meshwork was left intact and no thermal damage on the contiguous structures in all eyes, group II to 60-80 m.J Descemet's membrane was ruptured in 30% (3 eyes), thermal damage was 20% (2 eyes) on superficial structures, while group III to 80-100m.J there was a high risk of rupture of Descemet's membrane 50% (5 eyes), thermal damage was 30%(3 eyes) on superficial structures & 20%(2 eyes) on deep & superficial structures. Eyes were analyzed histologically by electron microscopy to study Descemet's membrane & the trabecular meshwork & the thermal damage on contiguous structures. Eyes with rupture of Descemet's membrane had total energy power of 11.75 J +/- 6.39, average power was 0.58W +/- 0.07 & power density 1155W/cm2 +/- 144, compared to eyes with no rupture 24.23J +/- 11.77 total energy power, 0.46W average power & 916.4W/cm2 +/- 227 power density. Thermal damage changes occurred at total energy power of 10.14 J, average power was 0.59W & power density 1180W/cm2, compared to eyes with no rupture 24.17J total energy power, 0.46W average power & 919.1W/cm2 power density.

Paper Details

Date Published: 13 July 2004
PDF: 9 pages
Proc. SPIE 5314, Ophthalmic Technologies XIV, (13 July 2004); doi: 10.1117/12.522751
Show Author Affiliations
Yehia A. Badr, Cairo Univ. (Egypt)
Ibrahim M. Taher, Cairo Univ. (Egypt)
Mostafa M. Bahgat, Cairo Univ. (Egypt)
Dina F. Ghoneim, Cairo Univ. (Egypt)


Published in SPIE Proceedings Vol. 5314:
Ophthalmic Technologies XIV
Fabrice Manns; Per G. Soderberg; Arthur Ho, Editor(s)

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