Simulation and Measurement of Optical Aberrations of Injection Molded Progressive Addition Lenses
Advisor:Raasch, Thomas W.
Yi, Allen Y.
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Series/Report no.:2014 Edward F. Hayes Graduate Research Forum. 28th
Injection molding is an important mass production tool in optical industry. In this research our aim is to develop a process of combining ultraprecision diamond turning and injection molding to create a unique low cost manufacturing process for progressive addition lenses or PALs. In industry, it is a well-known fact that refractive index variation and geometric deformation of injection molded lenses due to polymers’ rheological properties will distort their optical performances. To address this problem, we developed a method of determining the optical aberrations of the injection molded PALs. This method involves reconstructing the wavefront pattern in the presence of uneven refractive index distribution and surface warpage using a finite element method. In addition to numerical modeling, a measurement system based on a Shack-Hartmann wavefront sensor was used to verify the modeling results. The measured spherocylindrical powers and aberrations of the PALs were in good agreement with the model. Consequently, the optical aberrations of injection molded PALs were successfully predicted by finite element modeling. In summary, it was demonstrated in this study that numerical based optimization for PALs manufacturing is feasible.
Engineering: 1st Place (The Ohio State University Edward F. Hayes Graduate Research Forum)
National Science Foundation
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