Assessing the optical performance of multifocal (diffractive) intraocular lenses

Eppig, Timo; Scholz, Katja; Langenbucher, Achim

doi:10.1111/j.1475-1313.2008.00582.x

Cited by 25 publications

(20 citation statements)

References 24 publications

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“…27,28 Spherical multifocal IOLs are associated with higher straylight levels, 21 lower contrast sensitivity levels, 29 and higher levels of night-vision symptoms 30 than spherical monofocal IOLs. Multifocal IOLs with an aspheric optics may perform better than previous-generation multifocal IOLs.…”

Section: Discussionmentioning

confidence: 99%

Visual outcome and patient satisfaction after multifocal intraocular lens implantation: Aspheric versus spherical design

Vries

Webers

Verbakel

et al. 2010

Journal of Cataract and Refractive Surgery

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Section: Discussionmentioning

confidence: 99%

Visual outcome and patient satisfaction after multifocal intraocular lens implantation: Aspheric versus spherical design

Vries

Webers

Verbakel

et al. 2010

Journal of Cataract and Refractive Surgery

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“…To fully understand the nature of these effects it is interesting to characterize in a test bench [6] the optical performance of these IOLs. The Point Spread Function and Modulation Transfer Function are metrics widely used in other works to characterize the optical quality of different IOLs [7] [8]. It is less common, however, to analyze the energy distribution between the distance and near images and its variation with the pupil diameter.…”

Section: Introductionmentioning

confidence: 99%

Energy balance in apodized diffractive multifocal intaocular lenses

2011

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The energy distribution between the distance and near images formed in a model eye by three different apodized diffractive multifocal intraocular lenses (IOLs) is experimentally determined in an optical bench. The model eye has an artificial cornea with positive spherical aberration (SA) similar to human cornea. The level of SA upon the IOL, which is pupil size dependent, is controlled using a Hartmann-Shack wave sensor. The energy of the distance and near images as a function of the pupil size is experimentally obtained from image analysis. All three IOLs have the same base refractive power (20D) but different designs (aspheric, spherical) and add powers (+4.0 D, +3.0 D). The results show that in all the cases, the energy efficiency of the distance image decreases for large pupils, in contrast with the theoretical and simulated results that only consider the diffractive profile of the lens. As for the near image, since the diffractive zone responsible for the formation of this image has the same apodization factor in the spherical and aspheric lenses and the apertures involved are small (and so the level of SA), the results turn out to be similar for all the three IOL designs.

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“…The CURV (Lambda-X) is based on Placido rings and measures ROCs between 6 and 25 mm with an accuracy of 10 μm [17]. Other optical techniques for laboratory tests are based on wave-front sensing, OCT, and interferometric or imaging-based techniques [18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Inspection of freeform intraocular lens topography by phase measuring deflectometric methods

et al. 2013

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Manufacturing spherical, aspheric, and freeform surfaces requires testing throughout the development and production process. State-of-the-art topography measurement is limited in applicability for intraocular lenses (IOLs), and there is no dedicated commercial surface measurement system available for freeform IOLs. The purpose of this work was to validate a deflectometric setup for surface measurement, detection of defects, and shape fidelity analysis for the development and production of IOLs. The setup is based on a phase measuring deflectometer with a field-of-view of 80 mm×80 mm and a mean repetition accuracy of 1.6·10(-3) D. The technique is suitable for detection of global and local surface errors, extracted from geometry and topography analysis. For validation according to DIN ISO 5725:2002, spherical IOLs with radii of curvature of 10 and 20 mm, a commercial aspheric IOL, and single-sided freeform IOL samples were used.

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Assessing the optical performance of multifocal (diffractive) intraocular lenses

Cited by 25 publications

References 24 publications

Visual outcome and patient satisfaction after multifocal intraocular lens implantation: Aspheric versus spherical design

Visual outcome and patient satisfaction after multifocal intraocular lens implantation: Aspheric versus spherical design

Energy balance in apodized diffractive multifocal intaocular lenses

Inspection of freeform intraocular lens topography by phase measuring deflectometric methods

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