Diode - Pumped , Frequency - Doubled Neodymium : YAG 레이저와 Blue - Green 아르곤 레이저 홍채절개술의 비교

초록

Purpose : The solid-state, continuous-wave, frequency-doubled neodymium:yttrium-aluminum-garnet (Nd:YAG) laser pumped by diode laser has several advantages, including air cooling, higher electrical-to-optical efficiency ratios, and portability. The authors evaluated the use of the frequency-doubled Nd:YAG laser for peripheral iridotomy and compared it with the argon blue-green laser. Methods : Laser peripheral iridotomy was performed on 64 eyes of 47 patients with acute or chronic primary angle-closure glaucoma and narrow angles capable of closure. Thirty-one eyes of 25 patients were treated with the frequency-doubled Nd:YAG laser and 33 eyes of 22 patients were treated with the argon laser. Postoperative intraocular pressure, visual acuity, pre- and postoperative medication, number of laser spots, and failure of patency were compared. Results : Postlaser 1-hour intraocular pressure elevation greater than 10 mmHg was seen in one (3.2%) of the frequency-doubled Nd:YAG laser–treated eyes and six (17.6%) of the argon laser–treated eyes (p=0.055). The failure of patency occurred less often with the frequency-doubled Nd:YAG laser than with the argon laser (9.7% vs. 27.3%, p=0.081). The number of laser spots required was greater with the frequency-doubled Nd:YAG laser than with the argon laser (p=0.069). Preoperative intraocular pressure, postoperative intraocular pressure at 1 hour, 1 day, 1 month, and 3 months, visual acuity, pre- and postoperative antiglaucomatous medication, number of laser spots, and failure of patency were similar in the two groups. Conclusions : These results suggest that the frequency-doubled Nd:YAG laser is at least as effective and appears to be as safe as the argon laser. However, laser iridotomy with the frequency-doubled Nd:YAG laser may be more difficult than with the argon laser.

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