Aspheric optics at www.eyenirvaan.com

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Aspheric optics at www.eyenirvaan.com

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Aspheric optics at www.eyenirvaan.com

  1. 1. ASPERIC OPTICS SIMPLIFIED… Nilesh Thite M. Optom, FIACLE To view more presentations and articles, visit www.eyenirvaan.com
  2. 2. Aspheric Optics Simplified To view more presentations and articles, visit www.eyenirvaan.com
  3. 3. Progress Is it progress if cannibal uses knife and fork? To view more presentations and articles, visit www.eyenirvaan.com
  4. 4. Aspheric Surface Aspheric means non- spherical The radius of curvature, hence curvature changes from centre to periphery To view more presentations and articles, visit www.eyenirvaan.com
  5. 5. To view more presentations and articles, visit www.eyenirvaan.com
  6. 6. Conics To view more presentations and articles, visit www.eyenirvaan.com
  7. 7. Asphericity for Different Reasons  Progressive Addition  Control of aberration produced by the corrective lenses  Control of aberration of the Eye To view more presentations and articles, visit www.eyenirvaan.com
  8. 8. Perfection.. Perfection has one grave defect.. It is apt to be dull To view more presentations and articles, visit www.eyenirvaan.com
  9. 9. Aberration Deviation from proper or expected course Inability of an optical system to bring all incident rays to a desired image point To view more presentations and articles, visit www.eyenirvaan.com
  10. 10. Spherical Aberration To view more presentations and articles, visit www.eyenirvaan.com
  11. 11. Spherical Aberration One of the most frequent types of higher order Aberrations seen in population To view more presentations and articles, visit www.eyenirvaan.com
  12. 12. Spherical Aberration Perceived as blurring or halos Prominent in low illumination or low contrast Dilated pupils To view more presentations and articles, visit www.eyenirvaan.com
  13. 13. Aberration and Vision Mean Spherical Aberration -0.10 -0.05 0.00 0.05 0.10 0.15 0.20 0.25 4.0 4.5 5.0 5.5 6.0 6.5 Pupil aperture / mm Z400 To view more presentations and articles, visit www.eyenirvaan.com
  14. 14. To view more presentations and articles, visit www.eyenirvaan.com
  15. 15. Counterbalancing Inherent Aberration SF>1 SF<1 Spherical aberration Power -6.00D -5.00D-4.00D-3.00D-2.00D-1.00D -0.10μm -0.20μm LEVEL OF SPHERICAL ABERRATION OF CONTACT LENS WITH SPHERICAL SURFACES LEVEL OF SPHERICAL ABERRATION TO THEORETICALLY OFFSET POPULATION AVERAGE (ASSUMING PERFECT LENS CENTRATION) +0.20μm +0.10μm 0 LEVEL OF POPULATION AVERAGE POSITIVE SPHERICAL ABERRATION -7.00D To view more presentations and articles, visit www.eyenirvaan.com
  16. 16. To view more presentations and articles, visit www.eyenirvaan.com
  17. 17. Spherical Aberration No Spherical Aberration Spherical Aberration Induces Haloes and Reduces Contrast and Ultimately Resolution To view more presentations and articles, visit www.eyenirvaan.com
  18. 18. Impact of Aberrations Simulated retinal image at 6mm pupil size with +0.15 microns of spherical aberration Low light image without spherical aberration Low light image with spherical aberration Simulated retinal image – non aberrated To view more presentations and articles, visit www.eyenirvaan.com
  19. 19. Know your lens before committing benefits to the patients To view more presentations and articles, visit www.eyenirvaan.com
  20. 20. Landline, Mobiles and communicators We are Evolving.. To view more presentations and articles, visit www.eyenirvaan.com
  21. 21. To view more presentations and articles, visit www.eyenirvaan.com

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