Initial results of trifocal diffractive IOL implantation

Voskresenskaya, A. A.; Pozdeyeva, N.A.; Паштаев, Н. П.; Batkov, Yevgeniy; Treushnicov, Valeriy; Чередник, В. И.

doi:10.1007/s00417-010-1424-8

Cited by 76 publications

(71 citation statements)

References 25 publications

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“…1,2 These 3 foci can be generated by combining 2 bifocal diffractive profiles in 1 surface of the IOL 2 or by using a trifocal diffractive profile, combined or not with a bifocal diffractive optics. 1,3 Trifocal IOLs based on these 2 approaches have shown good visual, refractive, and contrast sensitivity outcomes in a relatively short term (up to 6 months of follow-up) 1,3-8 that are consistent with the results of some optical simulations using an optical bench. [9][10][11] However to date, there are no studies reporting the results with this modality of multifocal IOL in the medium and long term.…”

supporting

confidence: 67%

Implantation of a diffractive trifocal intraocular lens: One-year follow-up

Mojžíš

Majerova

Hrckova

et al. 2015

Journal of Cataract and Refractive Surgery

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supporting

confidence: 67%

Implantation of a diffractive trifocal intraocular lens: One-year follow-up

Mojžíš

Majerova

Hrckova

et al. 2015

Journal of Cataract and Refractive Surgery

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“…The outer region of the lens to the 6 mm edge sends light to the far and near foci exclusively. In contrast with other trifocal IOLs whose diffractive profile features are currently available, [9,11] to the best of our knowledge no details about the characteristics of the diffractive profile of the AT LISA tri 839MP have been disclosed by the manufacturer. Nevertheless, it is known [14] that this IOL has an aspheric design to produce a negative value of SA (c[4,0] Zernike coefficient of -0.18 µm for a 6 mm eye pupil) to compensate in part for the natural positive SA of human cornea.…”

Section: Iol Characteristicsmentioning

confidence: 99%

“…[6,7] To deal with this issue, Swanson disclosed a trifocal IOL [8] based on a binary phase profile that used the m = −1, m = 0 and m = 1 diffraction orders to obtain the far, intermediate and near foci respectively, each of them having a theoretical diffraction efficiency of 28.8% while the rest of the light energy (approximately 14%) was wasted in higher diffraction orders. The Record trifocal IOL, used for the first time in 36 eyes (28 patients) by Vorkresenkaya et al [9] is designed according to these principles. A different approach in the design of trifocal IOLs relies on the combination of two kinoform diffractive profiles with different step heights in the surface of the lens.…”

Section: Introductionmentioning

confidence: 99%

Energy efficiency of a new trifocal intraocular lens

Vega

Alba-Bueno

Millán

2014

J. Eur. Opt. Soc.-Rapid Publ.

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The light distribution among the far, intermediate and near foci of a new trifocal intraocular lens (IOL) is experimentally determined, as a function of the pupil size, from image analysis. The concept of focus energy efficiency is introduced because, in addition to the theoretical diffraction efficiency of the focus, it accounts for other factors that are naturally presented in the human eye such as the level of spherical aberration (SA) upon the IOL, light scattering at the diffractive steps or the depth of focus. The trifocal IOL is tested in-vitro in two eye models: the aberration-free ISO model, and a so called modified-ISO one that uses an artificial cornea with positive spherical SA in instead. The SA upon the IOL is measured with a Hartmann-Shack sensor and compared to the values of theoretical eye models. The results show, for large pupils, a notorious reduction of the energy efficiency of the far and near foci of the trifocal IOL due to two facts: the level of SA upon the IOL is larger than the value the lens is able to compensate for and there is significant light scattering at the diffractive steps. On the other hand, the energy efficiency of the intermediate focus for small pupils is enhanced by the contribution of the extended depth of focus of the near and far foci. Thus, while IOLs manufacturers tend to provide just the theoretical diffraction efficiency of the foci to show which would be the performance of the lens in terms of light distribution among the foci, our results put into evidence that this is better described by using the energy efficiency of the foci.

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“…Nowadays, the extended usage of computers and mobile devices has changed the preference of spectacle independence from near to intermediate distances. The latest generation of MIOLs based on diffractive platforms is able to distribute light in more than two different foci, the trifocal IOLs [2]- [4]. These three focal points can be generated in two ways, either by combining two bifocal diffractive profiles in one surface of the IOL [3] or by using a trifocal diffractive profile combined with a bifocal diffractive optic [2] [5].…”

Section: Introductionmentioning

confidence: 99%

“…The latest generation of MIOLs based on diffractive platforms is able to distribute light in more than two different foci, the trifocal IOLs [2]- [4]. These three focal points can be generated in two ways, either by combining two bifocal diffractive profiles in one surface of the IOL [3] or by using a trifocal diffractive profile combined with a bifocal diffractive optic [2] [5]. Besides MIOLs, other new concepts have been developed on the basis of a diffractive optic pattern, such as the extended range of vision IOL Tecnis Symfony.…”

Section: Introductionmentioning

confidence: 99%