白内障是眼科致盲性最高的眼病之一。随着白内障手术从复明性手术步入屈光性手术时代,传统老视矫正型人工晶状体已无法满足当今患者对于术后视觉质量的高要求。以往临床植入的晶状体多为单焦点人工晶状体,初步解决了术后远距离视力问题...白内障是眼科致盲性最高的眼病之一。随着白内障手术从复明性手术步入屈光性手术时代,传统老视矫正型人工晶状体已无法满足当今患者对于术后视觉质量的高要求。以往临床植入的晶状体多为单焦点人工晶状体,初步解决了术后远距离视力问题。但这种晶状体对中、近距离视力恢复效果不明显,仍满足不了患者全程脱镜的需求。景深延长型人工晶状体(Extended Depth-of-Focus Intraocular Lens, EDOF IOL)是一种新兴的技术,用于提高视力范围,特别是在中距离(例如,电脑工作所需的距离)。EDOF人工晶状体的出现可以填补单焦点和多焦点人工晶状体之间的空缺,其基于产生具有扩展深度的单焦点的原理,提供清晰的近距离视力。该设计的特点是通过引入一个低度的光学像差,使视觉在各个焦距之间有更平滑的过渡。Cataract is one of the most blinding diseases in ophthalmology. With the transition of cataract surgery from blindness prevention to refractive surgery, traditional presbyopic intraocular lenses can no longer meet the high requirements of patients for postoperative visual quality. In the past, most of the lenses applied in clinic were single-focus intraocular lenses, which initially solved the problem of long-distance vision after surgery. However, the effect of this kind of lens on the restoration of medium and short-distance vision is not obvious, and it still can not meet the needs of patients for full lens removal. Extended Depth-of-Focus Intraocular Lens (EDOF IOL) is an emerging technology for improving the range of vision, especially at medium distances (e.g. distances required for computer work). The emergence of EDOF IOL can fill the gap between single-focus and multi-focus IOL, based on the principle of producing a single focal point with an extended depth to provide a clear distance to near vision. The design features a smoother transition of vision between focal lengths by introducing a low degree of optical aberration.展开更多
工程和科学领域中的优化问题常常具有大量的约束限制,称为约束优化问题.这类问题要求算法有能力在可行域中寻找问题的最优解.本文针对约束优化问题提出一种集成多策略的差分进化算法(Differential Evolution with Ensemble Multi-Strate...工程和科学领域中的优化问题常常具有大量的约束限制,称为约束优化问题.这类问题要求算法有能力在可行域中寻找问题的最优解.本文针对约束优化问题提出一种集成多策略的差分进化算法(Differential Evolution with Ensemble Multi-Strategies,EMSDE).首先,提出一种用于约束优化的参数自适应策略,利用归一化罚函数作为权重引导参数自适应地生成.其次,结合约束和动态罚函数法设计一种新的约束处理技术.最后,采用CEC2017约束优化基准函数来测试EMSDE和7种经典的约束优化算法.实验结果表明,相比7种经典的算法,EMSDE算法具有很强的竞争力.展开更多
文摘白内障是眼科致盲性最高的眼病之一。随着白内障手术从复明性手术步入屈光性手术时代,传统老视矫正型人工晶状体已无法满足当今患者对于术后视觉质量的高要求。以往临床植入的晶状体多为单焦点人工晶状体,初步解决了术后远距离视力问题。但这种晶状体对中、近距离视力恢复效果不明显,仍满足不了患者全程脱镜的需求。景深延长型人工晶状体(Extended Depth-of-Focus Intraocular Lens, EDOF IOL)是一种新兴的技术,用于提高视力范围,特别是在中距离(例如,电脑工作所需的距离)。EDOF人工晶状体的出现可以填补单焦点和多焦点人工晶状体之间的空缺,其基于产生具有扩展深度的单焦点的原理,提供清晰的近距离视力。该设计的特点是通过引入一个低度的光学像差,使视觉在各个焦距之间有更平滑的过渡。Cataract is one of the most blinding diseases in ophthalmology. With the transition of cataract surgery from blindness prevention to refractive surgery, traditional presbyopic intraocular lenses can no longer meet the high requirements of patients for postoperative visual quality. In the past, most of the lenses applied in clinic were single-focus intraocular lenses, which initially solved the problem of long-distance vision after surgery. However, the effect of this kind of lens on the restoration of medium and short-distance vision is not obvious, and it still can not meet the needs of patients for full lens removal. Extended Depth-of-Focus Intraocular Lens (EDOF IOL) is an emerging technology for improving the range of vision, especially at medium distances (e.g. distances required for computer work). The emergence of EDOF IOL can fill the gap between single-focus and multi-focus IOL, based on the principle of producing a single focal point with an extended depth to provide a clear distance to near vision. The design features a smoother transition of vision between focal lengths by introducing a low degree of optical aberration.
文摘工程和科学领域中的优化问题常常具有大量的约束限制,称为约束优化问题.这类问题要求算法有能力在可行域中寻找问题的最优解.本文针对约束优化问题提出一种集成多策略的差分进化算法(Differential Evolution with Ensemble Multi-Strategies,EMSDE).首先,提出一种用于约束优化的参数自适应策略,利用归一化罚函数作为权重引导参数自适应地生成.其次,结合约束和动态罚函数法设计一种新的约束处理技术.最后,采用CEC2017约束优化基准函数来测试EMSDE和7种经典的约束优化算法.实验结果表明,相比7种经典的算法,EMSDE算法具有很强的竞争力.
