| Susceptibility of Various Intraocular Lenses to Nd: YAG Laser In Vitro. |
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Won Ryang Wee, Eui Sang Chung, Dong Myung Kim, Jin Hak Lee, Bong Leen Chang |
1Department of Ophthalmology, Seoul National University College ofMedicine, Seoul, Korea.
2The 2nd International Meeting on Advanced Excimer Laser and Cataract Surgery. |
| 인공수정체의 야그레이저에 의한 기계적 손상도에 대한 비생체 실험 |
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위원량(Won Ryang Wee),정의상(Eui Sang Chung),김동명(Dong Myung Kim),이진학(Jin Hak Lee),장봉린(Bong Leen Chang) |
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| Abstract |
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The purpose of this study was to evaluate the susceptibility of various intraocular lenses(IOLs) of different optic material to Nd:YAG laser in vitro. Four models of IOLs manufactured by different companies were selected and ten IOLs for each model were used for this study. Two models had lathe-cut polymethylmethacrylate(PMMA) optic, one silicone compound optic, and one acrylate/methacrylate copolymer optic. Q-switched Nd: YAG laser(7901 Nd-YAG laser, Coherent, Palo Alto, CA, USA) was used. The He-Ne aiming beam was focused on the posterior surface of optic, 2mm apart from the center of optic, and sixteen shots were applied to each optic with energy levels ranging from 0.3 to 2.0mJ with increment of 0.1 or 0.2mJ in a circular pattern. The spots were examined under phase contrast microscope and scanning electron microscope. The averages(+/-SD) of energy threshold at which damage was detected were 0.49+/-0.12mJ in silicone compound optic, 0.67+/-0.19mJ in acrylate/methacrylate copolyer optic, and 0.72+/-0.11mJ and 0.89+/-0.09mJ in lathe-cut PMMA optics. All interclass differences were statistically significant except the difference between lathe-cut PMMA optic with lower damage threshold and acrylate/methacrylate copolymer optic(Mann-Whitney test, p<.05). In conclusion, silicone compound and acrylate/methacrylate copolymer optics are more susceptible to Nd:YAG laser than PMMA optic in vitro and this suggests that in patients with high risk of developing severe posterior capsular opacification after cataract surgery, implantation of IOLs with PMMA optic is preferable and early Nd:YAG laser posterior capsulotomy with low energy is recommended in cases of implantation of foldable IOLs. |
| Key Words:
Damage threshold;Intraocular lens;Nd:YAG laser;Optic material |
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