Weghaupt H, Menapace R, Wedrich A
Universitäts-Augenklinik, Wien, Austria.
Graefes Arch Clin Exp Ophthalmol. 1993 Aug;231(8):449-52. doi: 10.1007/BF02044230.
As a particular test of visual function, contrast sensitivity reveals optical properties of Iogel pHema lenses in comparison to poly(methyl methacrylate) implants (PMMA). Sixteen patients with a hydrogel posterior chamber lens in one eye and a PMMA posterior chamber lens in the other were examined by means of contrast sensitivity measurements. Six stationary, vertical, sinusoidal modulated gratings with spatial frequencies of 0.5, 1, 3, 6, 11.4 and 22.8 cycles/degree were presented. Results of the two different implants were analyzed by a paired t-test. There was no significant statistical difference between the two types of lenses for any of the gratings presented. Despite different features like material, refractive index, design and UV-absorbing additive, there seems to be no difference between lenses made of hydrogel and those made of PMMA material with regard to functional vision as evaluated by contrast sensitivity testing.
作为视觉功能的一项特殊测试，对比敏感度揭示了Iogel pHema镜片与聚甲基丙烯酸甲酯植入物（PMMA）相比的光学特性。对16例患者进行了检查，这些患者一只眼睛植入水凝胶后房型人工晶状体，另一只眼睛植入PMMA后房型人工晶状体，并通过对比敏感度测量进行检测。呈现了六个空间频率分别为0.5、1、3、6、11.4和22.8周/度的静止垂直正弦调制光栅。通过配对t检验分析两种不同植入物的结果。对于所呈现的任何光栅，两种类型的镜片之间均无显著统计学差异。尽管在材料、折射率、设计和紫外线吸收添加剂等方面存在不同特性，但通过对比敏感度测试评估，水凝胶制成的镜片与PMMA材料制成的镜片在功能性视力方面似乎没有差异。
