Wang Y, Zhang J, Zhang Y
Department of Ophthalmology, First Affiliated Hospital, China Medical University, Shengyang 110001.
Zhonghua Yan Ke Za Zhi. 1998 Mar;34(2):103-5, 6.
To inquire the injuring effects of the Q-switched neodymium: yttrium aluminum garnet (Nd : YAG) laser on silicone, hydrogel (HEMA), acrylic, lathe cutting and cast molding polymethylmethacrylate (PMMA) intraocular lenses (IOLs).
The Nd : YAG of different energy was focused on the posterior surface of the IOL optic portion and shot in air and BSS separately. The percentages of IOL injuries were calculated, and the morphology of the IOL injuries was observed with a scanning electron microscope.
Percentages of IOL injury: When the same energy of Nd : YAG laser was used, the injuring effects on the same kind of IOLs in air and in BSS were similar, while the laser energies of 0.5 mJ and 1.0 mJ were used, the injuring effects on different kinds of IOLs were significantly different, and when the energy of the laser was more than 1.5 mJ, the injuring effects were almost the same. Under different conditions, the morphology of the injury on different kinds of IOLs was different.
(1) The sequence of resisting ability against Nd : YAG laser injury of different kinds of IOLs from strong to weak is: The lathe cutting PMMA IOL > acrylic IOL > cast molding PMMA IOL > HEMA IOL and silicone IOL. (2) The injuring effect of high energy Nd : YAG laser on rigid IOL is more severe than that on the soft IOL. (3) The size of IOL injuries is increased with the elevation of energy level of Nd : YAG laser.
探讨调Q钕：钇铝石榴石（Nd:YAG）激光对硅凝胶、水凝胶（HEMA）、丙烯酸酯、车削和铸模聚甲基丙烯酸甲酯（PMMA）人工晶状体（IOL）的损伤作用。
将不同能量的Nd:YAG激光聚焦于IOL光学部后表面，分别在空气中和平衡盐溶液（BSS）中进行射击。计算IOL损伤的百分比，并用扫描电子显微镜观察IOL损伤的形态。
IOL损伤百分比：使用相同能量的Nd:YAG激光时，在空气中和BSS中对同一种IOL的损伤作用相似，而使用0.5 mJ和1.0 mJ的激光能量时，对不同种类IOL的损伤作用有显著差异，当激光能量超过1.5 mJ时，损伤作用几乎相同。在不同条件下，不同种类IOL损伤的形态不同。
（1）不同种类IOL对Nd:YAG激光损伤的抵抗能力由强到弱的顺序为：车削PMMA IOL＞丙烯酸酯IOL＞铸模PMMA IOL＞HEMA IOL和硅凝胶IOL。（2）高能Nd:YAG激光对硬性IOL的损伤作用比对软性IOL更严重。（3）IOL损伤的大小随Nd:YAG激光能量水平的升高而增大。
