Visible Versus Near-Infrared Optical Performance of Diffractive Multifocal Intraocular Lenses

Vega, F.; Millán, Marı́a S.; Vila-Terricabras, Núria; Alba-Bueno, Francisco

doi:10.1167/iovs.15-17664

Cited by 20 publications

(28 citation statements)

References 43 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Lee et al [ 77 ] also reported a mean OSI of 1.82 with multifocal IOLs. However, the validity of all these studies with MIOLs is questionable because of the known limitations of the near-infrared optical performance of diffractive multifocal intraocular lenses [ 78 ], or the first-pass in the double-pass technique that can be affected by the size of the first ring [ 79 ]. Finally, OSI has found to be correlated with straylight parameters and even related to driving safety [ 43 ].…”

Section: Objective Technologies For Lens Evaluationmentioning

confidence: 99%

From Presbyopia to Cataracts: A Critical Review on Dysfunctional Lens Syndrome

Fernández¹,

Rodríguez‐Vallejo²,

Martínez³

et al. 2018

Journal of Ophthalmology

View full text Add to dashboard Cite

Dysfunctional lens syndrome (DLS) is a term coined to describe the natural aging changes in the crystalline lens. Different alterations in the refractive properties and transparency of the lens are produced during the development of presbyopia and cataract, such as changes in internal high order aberrations or an increase in ocular forward scattering, with a potentially significant impact on clinical measures, including visual acuity and contrast sensitivity. Objective technologies have emerged to solve the limits of current methods for the grading of the lens aging, which have been linked to the DLS term. However, there is still not a gold standard or evidence-based clinical guidelines around these new technologies despite multiple research studies have correlated their results with conventional methods such as visual acuity or the lens opacification system (LOCS), with more scientific background around the ocular scattering index (OSI) and Scheimpflug densitometry. In either case, DLS is not a new evidence-based concept that leads to new knowledge about crystalline lens aging but it is a nomenclature change of two existing terms, presbyopia and cataracts. Therefore, this term should be used with caution in the scientific peer-reviewed literature.

show abstract

Section: Objective Technologies For Lens Evaluationmentioning

confidence: 99%

From Presbyopia to Cataracts: A Critical Review on Dysfunctional Lens Syndrome

Fernández¹,

Rodríguez‐Vallejo²,

Martínez³

et al. 2018

Journal of Ophthalmology

View full text Add to dashboard Cite

show abstract

“…3,4 It assumes a pinhole object at infinity and a charge-coupled device (CCD) camera with linear response for digital image acquisition. The method first applies an edge-detection algorithm to segment the central core of the pinhole image at the focus plane of the lens (either the distance or the near focus in a 2f-IOL) and quantifies the amount of light intensity in the core (I core ) relative to the intensity in the full image that comprises the core and the background (I total ¼ I core þ I background ).…”

Section: Through-focus Energy Efficiency Of a Refractivediffractive Bmentioning

confidence: 99%

“…In addition to LCA, the energy distribution between the distance and near images of diffractive 2f-IOLs also shows a strong dependency on wavelength. 2,3 In this work, we studied and measured the chromatic properties of 4 aspheric diffractive 2f-IOLs (2 nonapodized and 2 apodized of different add power) using an experimental setup arranged on an optical bench. Two monofocal (1f-IOL) counterparts (Tecnis model ZA9003, from Abbott Medical Optics, and AcrySof model SN60WF, from Alcon) of the nonapodized and apodized 2f-IOLs, with similar base power, aspheric design, and material, also have been included as references in our study.…”

mentioning

confidence: 99%

Polychromatic Image Performance of Diffractive Bifocal Intraocular Lenses: Longitudinal Chromatic Aberration and Energy Efficiency

Millán

Vega

Ríos-López

2016

Invest. Ophthalmol. Vis. Sci.

Self Cite

View full text Add to dashboard Cite

Citation: Millán MS, Vega F, Ríos-López I. Polychromatic image performance of diffractive bifocal intraocular lenses: longitudinal chromatic aberration and energy efficiency. Invest Ophthalmol Vis Sci. 2016;57:202157: -202857: . DOI:10.1167 PURPOSE. The study evaluated-theoretically and experimentally-the longitudinal chromatic aberration (LCA) and through-focus energy efficiency (TF-EE) of diffractive-refractive bifocal intraocular lenses (2f-IOLs).METHODS. Four aspheric 2f-IOLs (Tecnis þ4.00 diopter [D] ZMA00, þ2.75 D ZKB00, and AcrySof þ4.0 D SN6AD3, þ2.5 D SV25T0) of same base power 30 D, but different design, additional (add) power, and different material, were tested in vitro in terms of TF-EE when illuminated by 3 red (k R ¼ 625 nm), green (k G ¼ 530 nm), and blue (k B ¼ 455 nm) lights. The LCA affecting the distance and near foci was derived theoretically and measured experimentally from the contributions of the IOLs' refractive and diffractive powers. Longitudinal chromatic aberration was evaluated in a pseudophakic schematic eye. RESULTS.The distance focus of all 2f-IOLs showed lower energy efficiency (EE) for the blue than for the red light. AcrySof IOLs showed the largest amount of positive LCA in the distance focus that, combined with corneal LCA, would increase the resulting distance LCA in a pseudophakic eye. The near focus of all 2f-IOLs showed higher EE for the blue than for the red light. Better compensation for the LCA of a pseudophakic eye at near focus is obtained with Tecnis than with AcrySof 2f-IOLs.CONCLUSIONS. The energy distribution between the foci of diffractive 2f-IOLs depends on the lens design, the illumination wavelength, and to a lesser extent, the add power. In distance vision, 2f-IOLs' refractive base power increases the positive LCA of prior ocular media, and the resulting LCA may even surpass the natural LCA of human eye. In near vision, however, the achromatizing effect of diffractive 2f-IOLs may compensate, in part, the natural eye's LCA.

show abstract

“…11,21 Ravikumar et al 16 showed computationally that achromatization by a diffractive IOL provided significant improvement in polychromatic retinal image quality. Diffractive multifocal IOLs in particular have interesting chromatic properties 12,22 because they are subject to both refractive chromatic aberration and wavelength-dependent diffractive effects. In a recent publication, Millán et al 23 evaluated, theoretically and on-bench, the LCA and through-focus energy efficiency of bifocal IOLs of two different designs and materials.…”

Section: Discussionmentioning

confidence: 99%

“…The dependence of the magnitude of LCA on distance is in agreement with previous studies that accounted for LCA in diffractive multifocal IOLs by optical simulations or on-bench measurements. Vega et al 22 compared the optical performance on-bench of diffractive multifocal IOLs with visible and near-infrared light and studied the variation in the energy balance between the different foci of the IOL, which is related to the dependence of the diffraction efficiency with wavelength. Multifocal IOLs often exhibit an asymmetrical energy distribution, normally biased to benefit the far focus against near/intermediate focus for larger pupils, particularly in apodized designs (eg, the FineVision POD F IOL) and with large pupils.…”

Section: Discussionmentioning

confidence: 99%