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首页> 外文会议>Ophthalmic Lens Design and Fabrication II >Achievement in machining intraocular lenses (IOLs) by interferometry control
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Achievement in machining intraocular lenses (IOLs) by interferometry control

机译：通过干涉测量控制加工人工晶状体（IOL）的成就

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Abstract: Machining raw material by a lathing operation is the most common method for making the optical part of a polymethyl-methacrylate (PMMA) IOL. Spherical surfaces have been used for many years to achieve this goal using the radioscope for in-process control. For a few years, advanced control techniques such as Talysurf or Fizeau interferometer have been used to achieve improved surface quality and ideal lathe setup. Machining an optimized conic surface would appear to be more difficult to control. CAD drawings of a conic surface of an optimized IOL versus a spherical surface show a difference in vault of a few microns, which can be seen easily on interferometer display fringes. It is then easier to control the asphericity of a lathed surface by achieving tolerance in fringes when the dome is within 1 to 4 fringes of a perfectly spherical surface. This method has been validated with several thousand lenses using the USAF target method as a routine control and has been shown to produce increased accuracy of lens power and resolution efficiency. !0
机译：摘要：通过车床加工机加工原材料是制造聚甲基丙烯酸甲酯（PMMA）IOL光学部件的最常用方法。球形表面已经被使用了很多年，通过使用放射镜进行过程控制来达到这个目的。几年来，先进的控制技术（例如Talysurf或Fizeau干涉仪）已用于实现改善的表面质量和理想的车床设置。加工优化的圆锥形表面似乎更难控制。经过优化的IOL的圆锥表面相对于球形表面的CAD图显示出拱顶的差异只有几微米，这在干涉仪显示条纹上很容易看出。这样，当圆顶位于理想球形表面的1-4个条纹之内时，通过在条纹中获得公差，可以更轻松地控制车床表面的非球面性。使用USAF目标方法作为常规控制方法，该方法已在数千个镜头中得到验证，并已证明可以提高镜头屈光度和分辨率的准确性。 ！0

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