在一九八四年亚特兰大举行的全美眼科学会会议上,Dr.Seymour Kern提出了一种能通过控制供给晶体的电压的变化而改变其焦距的晶体系统。根据这种“可变焦距的晶体”理论,Dr.Kern提出了发明调节性眼内晶体(Accommodating Intraoc ular Lens,IOL.)的设想。这篇文章主要介绍存在于自然界中的多种眼的调节方式和由人工合成的晶体可能达到的调节方式 At the National Academy of Ophthalmology meeting in Atlanta in 1984, Dr. Seymour Kern proposed a crystal system that changes its focal length by controlling the voltage supplied to the crystal. According to this theory of “variable focal length crystals”, Dr. Kern proposed the idea of ​​the invention of a accommodative intraocular lens (IOL.). This article focuses on the ways in which ocular conditioning exists in nature and the modalities that may be achieved by synthetic crystals