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Comparison of MTF Performance of Apodized Diffractive Multiofocal and Sector-Based IOLs

Comparison of MTF Performance of Apodized Diffractive Multiofocal and Sector-Based IOLs. Jim Schwiegerling, PhD University of Arizona Optical Sciences Ophthalmology & Vision Sciences Warren Hill, MD, FACS East Valley Ophthalmology 5620 E. Broadway Road Mesa, AZ 85206. Disclosure:

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Comparison of MTF Performance of Apodized Diffractive Multiofocal and Sector-Based IOLs

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  1. Comparison of MTF Performance of Apodized Diffractive Multiofocal and Sector-Based IOLs Jim Schwiegerling, PhD University of Arizona Optical Sciences Ophthalmology & Vision Sciences Warren Hill, MD, FACS East Valley Ophthalmology 5620 E. Broadway Road Mesa, AZ 85206 Disclosure: Hill: Consultant, Speaker & Research Support Alcon Research Schwiegerling: Research & Travel support from Alcon Research.

  2. Introduction The optical performance of +3D-Add aspheric apodized diffractive multifocal IOL is compared to +1.50D-Add and +3.00D-Add with sector-based bifocal IOL lens designs. • The diffractive multifocal lens is a +21D ReSTOR SN6AD1 (Alcon Laboratories). • The sector based IOLs are a +30D Lentis Mplus LS-312 MF 15 and a +25D Lentis Mplus LS-312 MF 30

  3. Measuring MTF • The IOL is placed in a wet cell mounted behind an artificial cornea. • The blurred image of a slit target is analyzed to determine the Modulation Transfer Function (MTF). • The slit is moved axially to measure MTF for different object distances.

  4. Lens Designs The apodized diffractive has a roughly 3mm multifocal diffractive zone in the center of the lens. The sector-based lens has a nearly 180 degree sector in the inferior portion of the lens with increased power.

  5. Slit Images • The following slide shows the raw slit images from our MTF testing system. • The grayscale has been inverted to highlight the effects of simultaneous vision on the image. • All images are taken under the same conditions. No additional adjustments to contrast or brightness have been done. • The near foci are taken as the highest contrast image in the near vision portion of the through focus measurement. The labeled value of the near foci is relative to the spectacle plane. • The apodized diffractive lens is specified as a +3D-Add at the IOL plane, which is equivalent to roughly a +2D-Add in the spectacle plane when vertex adjusted. • The sector-based lenses are specified as +3D-Add and +1.50-Add. The values are already in the spectacle plane.

  6. Slit Images Distance Foci Near Foci (Spectacle Plane) +2D-Add +3D-Add +1.25D-Add Apodized diffractive +25D Sector-based +30D Sector-based

  7. MTF Spatial Frequency = 50 cyc/mm and a 6 mm pupil.

  8. Conclusion • The MTF of the apodized diffractive had superior contrast for the distance foci. • For a 6 mm pupil, the apodized diffractive suppresses the performance of its near foci, but even under these consitions, the contrast was higher than the near foci of the +3D-Add sector-based lens. • The labeled add power for the apodized diffractive lens is in the IOL plane and must be vertex adjusted to the spectacle plane. The labeled add power for the sector-based lens is relative to the spectacle plane.

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