1 / 38

Design of the progressive addition lens by the optical software ZEMAX

Design of the progressive addition lens by the optical software ZEMAX. Outline. Absract Introduction (a) Paper survey (b) Motivation Principle and Specification Design result Conclusion & Future work References. Outline. Absract Introduction (a) Paper survey

nortone
Download Presentation

Design of the progressive addition lens by the optical software ZEMAX

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. Design of the progressive addition lens by the optical software ZEMAX

  2. Outline • Absract • Introduction (a) Paper survey (b) Motivation • Principle and Specification • Design result • Conclusion & Future work • References

  3. Outline • Absract • Introduction (a) Paper survey (b) Motivation • Principle and Specification • Design result • Conclusion & Future work • References

  4. Abstract • Use the geometrical optics and the optical design software ZEMAX to design the progressive addition lens. • The progressive addition lens (PALs) are conformed with far、middle and near distance. • Obtain the PALs surface’s addition diopter map by using the multi-configuration to set far、middle and near distance. • The unit of the human’ eye is diopter (D).

  5. Outline • Absract • Introduction (a) Paper survey (b) Motivation • Principle and Specification • Design result • Conclusion & Future work • References

  6. Introduction(a) paper survey • The earliest progressive lens patent was submitted in 1907 by Owen Aves[1]. • Several early progressive lens design realised on a single surface, empolyed a class of surfaces similar in optical effect to the surface geometry of a curled elephant’s trunk, as shown in Fig.1.

  7. Fig.1 Similar in principle to an elephant-trunk-shaped surface.[1]

  8. Far area distortion distortion Near area • According to the view field, the progressive addition lens can divided to far、middle、near and distortion area[1,3], as shown in Fig. 2. Fig.2 The area distribution of the progressive addition lens.

  9. Outline • Absract • Introduction (a) Paper survey (b) Motivation • Principle and Specification • Design result • Conclusion & Future work • References

  10. Introduction(b) Motivation • If the PALs ADD become bigger, the middle and near area will become narrow. • Also the distortion area will compress into the middle area, and the distortion level will bigger. • Improve the distortion level to smaller, and decrease the area size. • Make the middle and near area much bigger.

  11. With the PALs, human always have following symptoms. (a) feel dizzy lightly, and walk unsteady. (b) the judgment ability of the space decrease. (c) when look at the nearer distance, the eyeball must turn down to see the PALs’s near area. (d) use the PALs’s distortion area to look something, the image will become fuzzy.

  12. Outline • Absract • Introduction (a) Paper survey (b) Motivation • Principle and Specification • Design result • Conclusion & Future work • References

  13. Principle (a) Aberration (b) Distortion (c) Eyeball curvature

  14. (a) Aberration[4,5] • In the situation of the paraxial degree , after the object through the optical system, the difference of the ideal image position and the actual location shall be aberration. • Paraxial approximation was established when the axis very close to the optical axis , the actual light can not fully meet the conditions of paraxial approximation. • When the light does not meet the conditions of paraxial approximation, the image will be different from the actual imaging.

  15. (b) Distortion • The distortion is a lens or lens system to a shape of an object caused by the image can not be completely original, like the system to a shape similar to the image caused by an object. • The distortion isn’t related with the image definition, but only means the location of each image point is not in its ideal position. • If, as point location is more than an ideal location close to the optical axis, then known as the barrel distortion. • On the contrary, away from the optical axis, then known as the pincushion distortion, as shown in Fig. 3.

  16. (b) Original (a) barrel distortion (c) Pincushion distortion Fig.3 distortion

  17. (c) Eyeball curvature • Decide the eye mode before design the Spectacles lenses. • If set the diopter too large, it will result in the lens design does not meet the user to wear to use. • Because of changes in diopter is too large, making them extremely uncomfortable to wear, and the feeling will be a kind of jump-order even feel dizzy.

  18. According to the following equation, we calculate the eyeball’s focal length at the different location respectively. • To reach the respective viewing far, middle, nearly three kinds of distance area, are watch clearly without ambiguity. (1) • With the obtained focal length f and following equation,we can calculate the eyeball’s curvature. (2)

  19. Specification Table 1. The specification

  20. Outline • Absract • Introduction (a) Paper survey (b) Motivation • Principle and Specification • Design result • Conclusion & Future work • References

  21. Design result[6,7] Fig.4 The 3D layout map of the far area

  22. Fig.5 The 3D layout map of the middle area

  23. Fig.6 The 3D layout map of the near area

  24. Far area 3D layout Middle area 3D layout Near area 3D layout Fig. 7 The comparison of the different area 3D layout map

  25. -1.50 D -2.25 D -1.75 D -2.50 D -2.75 D Fig.8 The power field map of the far area Fig.9 The power field map of the middle area

  26. -1.00 D -1.25 D Fig.10 The Power field map of the near area

  27. Fig.11 The MTF map of the far area

  28. Fig.12 The MTF map of the middle area

  29. Fig.13 The MTF map of the near area

  30. Fig.14 The aberration map of the far area

  31. Fig.15 The aberration map of the middle area

  32. Fig.16 The aberration map of the near area

  33. Table 2. The simulation result

  34. Outline • Absract • Introduction (a) Paper survey (b) Motivation • Principle and Specification • Design result • Conclusion & Future work • References

  35. Conclusion & Future Work • I’ve been finish the fundamental design of the human eye with -3 diopter. • About selecting the coefficient whether it will effect the simulation or not is the main problem. • According to the power field map, we can find out the coefficient selection to effect the distribution. • The following future work is decide the coefficient selection, and make the distortion area length longer after simulation. • Make the distortion area smaller.

  36. Outline • Absract • Introduction (a) Paper survey (b) Motivation • Principle and Specification • Design result • Conclusion & Future work • References

  37. References [1] DarryI J Meister, Scott W Fisher, “Progress in the spectacle correction of presbyopia. Part 1:Design and development of progressive lenses” , Clin. Exp. Optom. 91: 3: 240-250, (2008) [2] DarryI J Meister, Scott W Fisher, “Progress in the spectacle correction of presbyopia. Part 2:Modern progressive lens technologies” , Clin. Exp. Optom. 91: 3: 240-250,(2008) [3] Gunther H. Guilino, “Design philosophy for progressive addition lenses”, Applied Optics, Vol. 32, No. 1, January (1993) [4] David A. Atchison, “Spectacle lens design:a review”, Applied Optics, Vol. 31, No. 19, July (1992) [5] Bernard Bourdoncle, Jean Pierre Chauveau, and Jean Louis Mercier, “Traps in displaying optical performances of a progressive addition lenses”, Applied Optics, Vol. 31, No. 19, 1 July (1992) [6] Colin Fowler, “Recent trends in progressive power lenses” , Ophthal. Physiol. Opt. Vol 18, No. 2, pp. 234-237, (1998) [7] J. Loos, Ph. Slusallek, H.–P. Seidel, “Using Wavefront Tracing for the Visualization and Optimization of Progressive Lenses”, Eurographics 98, Vol. 17, No. 3, (1998)

  38. Thank you for your attention

More Related