Hara T, Hara T, Yasuda A, Yamada Y
Hara Eye Hospital, Utsunomiya, Japan.
Ophthalmic Surg. 1990 Feb;21(2):128-33.
We designed an intraocular lens (IOL) with spring action, which we call the Spring IOL, with the idea of providing a slight but adequate accommodative power. The Spring IOL consists of two 6.0-mm optics, held 4.38 mm apart, and four flexible loops. The optics are made of polymethylmethacrylate (PMMA) and the loops of polyvinylidene fluoride. The lens's refractive power is provided by the anterior optic; the posterior optic acts as a footplate to restrict the anteroposterior movement of the anterior optic. By torsionally compressing the obliquely arranged loops, a 10.0-mm 3-dimensional IOL can be reduced to 6.0 mm and inserted in the capsular bag through a 3.5-mm capsular opening. Because the Spring IOL is made of the same materials as conventional IOLs, most of the problems hindering the development of a refilling material (which could also provide accommodation) are avoided. In this first report we discuss the design of the lens, the refractive theory involved, and our experience inserting it in an excised animal eye.
我们设计了一种具有弹簧作用的人工晶状体（IOL），我们称之为弹簧式人工晶状体，旨在提供轻微但足够的调节能力。弹簧式人工晶状体由两个直径6.0毫米的光学部件组成，它们之间相隔4.38毫米，还有四个柔性环。光学部件由聚甲基丙烯酸甲酯（PMMA）制成，环由聚偏二氟乙烯制成。晶状体的屈光力由前光学部件提供；后光学部件用作脚板以限制前光学部件的前后移动。通过扭转压缩倾斜排列的环，一个10.0毫米的三维人工晶状体可以缩小到6.0毫米，并通过一个3.5毫米的囊袋开口插入囊袋中。由于弹簧式人工晶状体与传统人工晶状体采用相同的材料，因此避免了阻碍可再填充材料（也可提供调节能力）发展的大多数问题。在这份首次报告中，我们讨论了晶状体的设计、所涉及的屈光理论以及我们将其插入摘除的动物眼中的经验。
