Influence on Visual Quality of Intraoperative Orientation of Asymmetric Intraocular Lenses

Bonaque-González, Sergio; Rı́os, Susana; Amigó, Alfredo; López‐Gil, Norberto

doi:10.3928/1081597x-20150922-01

Cited by 20 publications

(9 citation statements)

References 16 publications

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“…In a previous study we simulated pure simultaneous vision [11], an ideal situation in which the entire pupil is used for far vision and near vision at the same time, as it occurs in diffractive designs. On the other hand, computational studies have shown that the specific pupillary distribution for near and far produces differences in the thru-focus optical performance both in diffraction-limited eyes with multizone radial and angular distributions [14,24]), and in real eyes with angular bifocal patterns at different orientations [16,25]. The new simultaneous vision simulator presented in this study is capable of simulating any bifocal pupillary pattern, optically programmed by means of a Spatial Light Modulator, expanding the capability of simulating any refractive bifocal design.…”

Section: Discussionmentioning

confidence: 99%

“…The patterns tested in this study include designs reminiscent of lenses existing in the market (i.e. bisegmented angular patterns such as that found in the M-Plus IOL, Oculentis Inc [15,16] tested in different orientations, or concentric bifocal patterns such as those found in the ReZoom, AMO [17]). A psychophysical paradigm was implemented to answer the following questions: Do some bifocal patterns provide better perceived quality than others?…”

Section: Introductionmentioning

confidence: 99%

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Perceived image quality with simulated segmented bifocal corrections

Dorronsoro¹,

Radhakrishnan²,

Gracia³

et al. 2016

Biomed. Opt. Express

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Bifocal contact or intraocular lenses use the principle of simultaneous vision to correct for presbyopia. A modified two-channel simultaneous vision simulator provided with an amplitude transmission spatial light modulator was used to optically simulate 14 segmented bifocal patterns (+ 3 diopters addition) with different far/near pupillary distributions of equal energy. Five subjects with paralyzed accommodation evaluated image quality and subjective preference through the segmented bifocal corrections. There are strong and systematic perceptual differences across the patterns, subjects and observation distances: 48% of the conditions evaluated were significantly preferred or rejected. Optical simulations (in terms of through-focus Strehl ratio from Hartmann-Shack aberrometry) accurately predicted the pattern producing the highest perceived quality in 4 out of 5 patients, both for far and near vision. These perceptual differences found arise primarily from optical grounds, but have an important neural component.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Perceived image quality with simulated segmented bifocal corrections

Dorronsoro¹,

Radhakrishnan²,

Gracia³

et al. 2016

Biomed. Opt. Express

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show abstract

“…We also included the neural contrast threshold (NCT) in the calculations. 23 This curve provides information on the minimum contrast that certain frequencies must have to be detected by the visual system. The intersection point between this curve and the real (OTF) allows for the determination of the cutoff frequency of the visual system.…”

Section: Numerical Evaluationmentioning

confidence: 99%

Pupil size stability of the cubic phase mask solution for presbyopia

2018

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Presbyopia correction involves different types of studies such as lens design, clinical study, and the development of objective metrics, such as the visual Strehl ratio. Different contact lens designs have been proposed for presbyopia correction, but performance depends on pupil diameter. We will analyze the potential use of a nonsymmetrical element, a cubic phase mask (CPM) solution, to develop a contact or intraocular lens whose performance is nearly insensitive to changes in pupil diameter. We will show the through focus optical transfer function of the proposed element for different pupil diameters ranging from 3 to 7 mm. Additionally, we will show the images obtained through computation and experiment for a group of eye charts with different visual acuities. Our results show that a CPM shaped as 7.07 μm*(Z33-Z3-3)-0.9 μmZ20 is a good solution for a range of clear vision with a visual acuity of at least 0.1 logMar from 0.4 to 6 m for pupil diameters in the 3- to 7-mm range. Our results appear to be a good starting point for further development and study of this kind of CPM solution for presbyopia.

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“…Схожие данные были получены в исследовании S. Bonaque-Gonzalez с соавт. [16], в котором на примере Lentis Mplus LS 312 MF был сделан вывод, что острота зрения не имеет статистических различий в случае имплантации ИОЛ в правильный или неправильный меридиан. Однако было установлено, что оптимальная ориентация интраокулярной линзы вызывает улучшение расчетного параметра качества изображения VSMTF (Visually modulated transfer function) на 58±19% по сравнению с неправильной ориентацией ИОЛ.…”

Section: A б влияние положения добавочного сегмента на остроту зренияunclassified

Modern Aspects of Multifocal Intraocular Correction: A Review

et al. 2017

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During the last decade multifocal intraocular lenses (IOL) became widely used in cataract surgery and proved to be effective in recovery of visual functions. Lots of clinical studies with different multifocal IOL models showed high effectiveness of multifocal correction to achieve good visual quality for far, intermediate, and near distances. Uncorrected visual acuity at a distance is equal to multifocal and monofocal correction, while uncorrected near vision is significantly better with multifocal IOLs. Additional segment position in asymmetric multifocal IOL models did not significantly influence on visual acuity. Multiple multifocal IOL designs (bifocal, trifocal) and ADD power level provide different functional results for near and intermediate distances which allows to select the specific IOL model depending on the patient`s needs. The review covers the following aspects of multifocal intraocular correction: update for classification of multifocal IOLs, visual acuity (functional results) at different distances after multifocal IOL implantation, comparison of clinical results with different multifocal IOL designs and add power levels, influence of add segment position in asymmetric multifocal IOLs on visual quality, comparison between multifocal and monofocal correction.

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Influence on Visual Quality of Intraoperative Orientation of Asymmetric Intraocular Lenses

Abstract: The results suggest that implantation of this nonrotational symmetric IOL should improve visual outcomes if it is oriented to coincide with a customized meridian. A simple, practical method is proposed to find an approximation to the angle that an Mplus IOL should be inserted.

Cited by 20 publications

References 16 publications

Perceived image quality with simulated segmented bifocal corrections

Perceived image quality with simulated segmented bifocal corrections

Pupil size stability of the cubic phase mask solution for presbyopia

Modern Aspects of Multifocal Intraocular Correction: A Review

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