Dunne M C, Barnes D A, Misson G P
Department of Vision Sciences, Aston University, Birmingham, United Kingdom.
Optom Vis Sci. 1991 Dec;68(12):957-9. doi: 10.1097/00006324-199112000-00009.
Aphakic eyes possess considerably less oblique astigmatism than phakic eyes. The possibility that posterior iris displacement after lens extraction accounts for the observed reduction in oblique astigmatism is tested in this study. Oblique astigmatism was calculated for a phakic and an aphakic schematic eye. With no iris displacement little reduction of oblique astigmatism occurred contrary to experimental findings. However, introduction of varying levels of iris displacement reduced this aberration to values found experimentally. Posterior iris displacement (mean = 1.19 mm) was confirmed in vivo by pre- and postoperative anterior chamber pachometry in eight patients.
无晶状体眼的斜向散光比有晶状体眼少得多。本研究检验了晶状体摘除术后虹膜后移导致观察到的斜向散光减少的可能性。计算了有晶状体和无晶状体模型眼的斜向散光。在没有虹膜移位的情况下，斜向散光几乎没有减少，这与实验结果相反。然而，引入不同程度的虹膜移位可将这种像差降低到实验中发现的值。通过对8例患者术前和术后前房测厚术在体内证实了虹膜后移（平均 = 1.19毫米）。
