Downing J E, Alberhasky M T
Greenview Hospital, Bowling Green, Kentucky.
J Cataract Refract Surg. 1990 Nov;16(6):732-6. doi: 10.1016/s0886-3350(13)81016-4.
Biconvex posterior chamber lenses have optical advantages and decrease the risk of capsular opacification, but they are more likely to be pitted during ND:YAG capsulotomy because of apposition of the lens to the capsule. This study reports the likelihood of surface damage to different formulations of poly(methyl methacrylate) at the energy levels required to open posterior capsules. Molded lenses are more easily damaged than higher molecular weight lathe-cut materials (P less than .01), as expected. However, by keeping energy output low, even injection-molded lenses showed minimal damage, with mean pit size 39 +/- 39 microns at 1 mJ. By using a converging contact lens, low power, and keeping the focus behind the capsule, damage to all materials tested should be clinically insignificant.
双凸后房型人工晶状体具有光学优势并降低了囊膜混浊的风险，但由于晶状体与囊膜的贴附，它们在钕：钇铝石榴石激光晶状体后囊切开术中更易出现凹痕。本研究报告了在打开后囊所需的能量水平下，不同配方的聚甲基丙烯酸甲酯表面受损的可能性。正如预期的那样，模制晶状体比高分子量车削材料更容易受损（P小于0.01）。然而，通过保持低能量输出，即使是注射模制晶状体也显示出最小的损伤，在1毫焦时平均凹痕大小为39±39微米。通过使用会聚隐形眼镜、低功率并将焦点保持在囊膜后方，对所有测试材料的损伤在临床上应无显著意义。
