Journal of the Korean Society for Precision Engineering (한국정밀공학회지)

Korean Society for Precision Engineering (한국정밀공학회)
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Development of Free-form PALs for Correcting Wavefront Refraction

파면굴절력 교정을 위한 자유형상 누진가입도렌즈 개발

  • Baarg, Saang-Bai (Department of Nano-optical Engineering, Korea Polytechnic Univ.) ;
  • Jeong, Mee-Suk (Department of Nano-optical Engineering, Korea Polytechnic Univ.)
  • 박상배 (한국산업기술대학교 나노-광공학과) ;
  • 정미숙 (한국산업기술대학교 나노-광공학과)
  • Published : 2010.02.01
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Abstract

In this paper, two kind of free-form progressive addition lenses (PALs) were designed with Zernike polynomial surface and anatomically accurate finite presbyopic schematic eyes which have aspheric cornea, aspheric GRIN crystalline lens, aspheric retina, and Gaussian apodization factor. Geometrical and diffraction MTFs were used for the optimization process in sequence. 5th orders of Zernike polynomials were used for the evaluation of progression zones of the two examples. The target MTF was set as 0.22 at 100 lp/mm which satisfies the standard visual resolution. These examples were fabricated with a CNC diamond turning machine controlled by slow tool servo (STS). After polishing process, the wavefront aberrations were measured with a laser interferometer on the ten test points across the progression zones and then compared with three current commercially available PALs on the optical performance. Astigmatic aberrations of the examples are very lower than the three selected PALs and have more increased stabilized progressive intermediate zones and near zones. It is expected to give better clear and comfortable distance, intermediate and near visions than other conventional PALs and to improve the adaptability of presbyopic patients to PALs.

Keywords

References

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