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15 October 2012 Freeform ophthalmic lenses power map measurement based on two-dimensional Ronchi test techniques
Yuanyuan Wang; Jianqi Cai; Xiaozhou Yu; Fan Lu
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Proceedings Volume 8417, 6th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment; 84173A (2012) https://doi.org/10.1117/12.977632
Event: 6th International Symposium on Advanced Optical Manufacturing and Testing Technologies (AOMATT 2012), 2012, Xiamen, China
Abstract
With the development of freeform ophthalmic lenses, especially the appearance of progressive addition lens, the traditional optical lensometer can’t satisfy the optical power measurement requirements. Freeform ophthalmic lenses involve high resolution technological manufacturing processes, due to the particular non-symmetrical, aspherical form of their convex surface. However, the testing of the optical power is not usually performed using whole-field methods because of the high dynamic range and resolution required for the slope changes in the convex surface. Applying some simple enhancements, a two-dimensional Ronchi test technique can be used to obtain accurate power distribution maps of freeform ophthalmic lenses. In this paper, the principle and optical structure of freeform Lens power map measurement based on two-dimensional Ronchi test techniques is introduced. The system structure is described in detail, and a simulation is made to analyze the influence of distance change which is from the Ronchi grating to ground glass.
© (2012) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
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Yuanyuan Wang, Jianqi Cai, Xiaozhou Yu, and Fan Lu "Freeform ophthalmic lenses power map measurement based on two-dimensional Ronchi test techniques", Proc. SPIE 8417, 6th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment, 84173A (15 October 2012); https://doi.org/10.1117/12.977632
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