不同设计的非球面人工晶状体植入术后的对比敏感度比较

Compare contrast sensitivity in eyes implanted with two different aspheric intraocular lenses

目的比较两种不同设计的非球面人T晶状体植入术后患者对比敏感度的改变。方法选择连续人院并拟由同一临床经验丰富的医师完成白内障超声乳化联合人T晶状体植入手术的患者63例（90只眼），随机分为三组，每组30只眼。组A患者植入前表面非球面修饰的人工晶状体（AMOTecnisZA9003型），组B植入后表面非球面修饰的人工晶状体（AlconIQSN60WF型），对照组植入单焦球面人工晶状体（AMOAR40e）。术后6个月对三组患者进行不同照明条件下（3cd／m^2，85cd／m^2），四种不同空间频率下（3c／d，6c／d，12c／d，18c／d）的对比敏感度（Cs）测定并进行比较。结果两组非球面晶状体植人的患者术后对比敏感度较球面晶状体植入术的患者更好，其中在低空间频率下（3c／d、6c／d）差异有统计学意义（P〈0．05）。在眩光条件下，球面晶体植入患者在高空间频率（18c／d）下的对比敏感度下降（P〈0．05），而非球面晶状体组患者则耐受良好。结论两种非球面人工晶状体都能获得良好地视功能，相比传统的球面型人工晶状体，新的非球面设计理念可以带来更好地视觉质量。

Objective To compare the contrast sensitivity （CS） of different aspheric implanted intraocular lenses. Methods Ninety patients were randomized to receive three types of IOL： an aspheric IOL with a modified anterior surface （AMO Tecnis ZA 9003, 30 eyes, Group A）, an aspheric IOL with a modified posterior surface （Alcon IQ SN60WF, 30 eyes, Group B） and an IOL with spherical surface （AMO AR40e, 30 eyes as control group）. All the operations were finished by one experienced operator. The contrast sensitivity （CS） under mesopic （3 cd/m^2） and photopic （85 cd/m^2） condition with 4 different spatial frequencies of 3, 6, 12, 18 cycles per degree （c/d） were performed 6 months post- operatively. Results The patients of two aspheric intraocular lenses groups had better contrast sensitivity after operation than the patients with spherical lenses. There was a significant difference between the two aspheric groups and the spherical group under the low spatial frequencies of 3, 6 c/d （P 〈0.05）. With a glare source of 85cd/m2, the patients with spherical lenses had lower contrast sensitivity under the spatial frequency of 18c/d but two aspheric groups. Conclusions The two aspheric intraocular lenses are better for the quality of vision for patients compared with the traditional spherical lenses.