Switchable liquid crystal contact lenses: dynamic vision for the ageing eye
Switchable liquid crystal contact lenses: dynamic vision for the ageing eye
复制标题
可切换液晶隐形眼镜：老化眼睛的动态视觉
DOI：
10.1117/12.2044676
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发表时间：
2014
期刊：
影响因子：
1.9
通讯作者：
J. Clamp
中科院分区：
文献类型：
--
作者：
H. Milton;H. Gleeson;P. Morgan;J. Goodby;S. Cowling;J. Clamp
眼睛无法聚焦在附近的物体上，老花眼，大约100%的50岁以上的人都患有。液晶（LC）眼镜片已显示出巨大的潜力，用于矫正老花眼。然而，矫正接触透镜使用者的老花眼已被证明是难以实现的，并且现有的商业选择在视力和舒适度方面遭受重大损害。我们描述了一种新颖的接触透镜，其包括液晶元件，该液晶元件提供矫正老花眼，而没有与其他技术相关联的折衷。我们使用平衡光学系统制造了变焦透镜，提供近视力所需的额外光焦度（通常为+1.00 D至+2.00 D）。该系统使用来自两个基板的正光焦度和来自LC层的可变负光焦度来形成平衡的光学系统，该光学系统在未通电时校正远视力。在施加电压时，液晶层的折射率降低，导致系统中的附加光功率，提供等同于阅读眼镜的校正。我们的新技术基于传统的隐形透镜材料，可以直接放置在眼睛上。所采用的液晶透镜非常适合于与接触透镜相关的小光学区域。我们比较了几种不同的LC材料和几何形状，这是适合我们的应用，并讨论了开关时间，光学质量和工作电压的材料和几何形状的影响。我们的隐形眼镜通常在响应< 10 Vrms时切换± 2.00 D，响应时间约为一秒。
The inability of the eye to focus on nearby objects, presbyopia, is suffered by ~100% of people over the age of 50. Liquid crystal (LC) spectacle lenses have shown great potential for correcting presbyopia. However, correcting presbyopia in contact lens users has proven elusive and existing commercial options suffer significant compromises in vision and comfort. We describe a novel contact lens that includes a liquid crystal element that offers to correct presbyopia without the compromises associated with other technologies. We fabricated variable focus lenses using a balanced optical system, providing the additional optical power presbyopes require for near vision (typically +1.00 D to +2.00 D). The system uses positive optical power from the two substrates and variable negative optical power from the LC layer to form a balanced optical system which, when unpowered, corrects distance vision. Upon voltage application, the liquid crystal layer decreases in refractive index, resulting in additional optical power in the system, offering correction equivalent to reading glasses. Our new technology is based on a traditional contact lens material which could be placed directly on the eye. The liquid crystal lens employed is well suited to the small optical areas associated with contact lenses. We compare several different LC materials and geometries which are suitable for our application, and discuss the influence of material and geometry on switching times, optical quality and operating voltage. Our contact lenses typically switch ±2.00D in response to < 10 Vrms with response times of the order of a second.