Optical power distribution of refractive and aspheric multifocal contact lenses: Effect of pupil size

Madrid-Costa, David; Ruiz-Alcocer, Javier; García‐Lázaro, Santiago; Ferrer-Blasco, Teresa; Montés‐Micó, Robert

doi:10.1016/j.clae.2015.03.008

Cited by 57 publications

(28 citation statements)

References 20 publications

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“…Multifocal designs involve a progressive, rotationally symmetric gradation of power from the centre to the edge of the contact lens optical zone. This is achieved by the use of one or more aspheric surfaces, which produce greater power either in the lens centre (centre‐near) or in the periphery (centre‐distance) …”

Section: Simultaneous Vision Versus Simultaneous Image Contact Lensesmentioning

confidence: 99%

“…The performance of progressive aspheric designs is clearly dependent on pupil diameter, particularly in the case of simple parabolic power profiles . Therefore, there is a marked interaction between the pupil diameter and the power profiles of the lenses, with a crucial effect on the distance correction and near addition provided by the multifocal contact lenses …”

Section: Fitting Processmentioning

confidence: 99%

“…The patient would need a larger pupil diameter for the lens to provide the distance correction . In reverse, if we select a lens with an over‐negative correction, it will provide a lower near‐addition but the patient will require a smaller pupil diameter to obtain distance correction …”

Section: Fitting Toolsmentioning

confidence: 99%

See 2 more Smart Citations

Soft multifocal simultaneous image contact lenses: a review

Pérez-Prados

Piñero

Pérez-Cambrodí³

et al. 2017

Clinical and Experimental Optometry

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Soft multifocal simultaneous image contact lenses have boomed in recent years due to the growing number of presbyopic patients demanding visual solutions, allowing them to maintain their current standard of living. The concept of ‘simultaneous image’ is based on blur interpretation and/or blur tolerance of superimposed multiple images on the retina formed by various powers of a contact lens. This is the basis for a specific type of multifocal contact lens developed for the compensation of presbyopia. Manufacturers have released a great variety of soft simultaneous image lens designs to meet different patient needs but their fitting is still unsatisfactory in some cases. Some presbyopes discontinue wearing contact lenses due to some limitations in visual quality and comfort that can be overcome with an appropriate contact lens selection based on a comprehensive pre‐fitting evaluation. This paper aims to review the different types of soft multifocal contact lenses that are currently available for presbyopic correction and to define the steps and factors crucial for their fitting, such as pupil, aberrations, accommodation and centring. A discussion about useful tools to achieve a customised fitting leading to a successful outcome, such as the defocus curve, power profile and questionnaires, is performed.

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Section: Simultaneous Vision Versus Simultaneous Image Contact Lensesmentioning

confidence: 99%

Section: Fitting Processmentioning

confidence: 99%

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Soft multifocal simultaneous image contact lenses: a review

Pérez-Prados

Piñero

Pérez-Cambrodí³

et al. 2017

Clinical and Experimental Optometry

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“…Optical profiles of contact lenses for presbyopia (i.e., lens power as a function of the distance to the centre of the lens) can be very different. [3][4][5][6] Bifocal profiles present zones with specific powers for distance and near correction with a very steep transition, while multifocal profiles have a progressive and continuous transition of power from distance to near correction.…”

Section: Introductionmentioning

confidence: 99%

Simulation of commercial vs theoretically optimised contact lenses for presbyopia

Legras

Rio

2017

Ophthalmic Physiologic Optic

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Purpose: To compare theoretically optimised bifocal contact lens optical designs to commercially available optical designs for presbyopia. Methods: Retinal images were simulated, using a numerical eye model, from -6 (i.e., near vision) to +2 D for each 0.25 D. Ten optical profiles were simulated. Four of them corresponded to commercial contact lenses (i.e., Acuvue Oasys for Presbyopiaâ, Air Optix Aqua Multifocalâ, Purevision Multifocalâ and Distance Biofinity Multifocalâ). We also included six optimised profiles: (1) a combination of primary and secondary spherical aberration, (2) bifocal profiles with 2, 5 and 8 concentric zones, and (3) a combination of spherical aberrations with the 5 and 8 zones profiles. Twenty subjects scored the quality of vision of calculated images (i.e., three high-contrast 0.40 logMAR letters) for each design and vergence with a five-item continuous grading scale. They viewed these images through their best sphero-cylindrical correction and a 3-mm pupil to limit the impact of their aberrations. To quantify the ability of a bifocal optic to maintain a certain level of quality of vision, we calculated two criteria: (1) the area under the through-focus quality of vision curve higher than 2 (i.e., limit between poor and fair quality of vision) normalised by the same area calculated on the naked eye's curve, and (2) the width of the curve at a level of 2 (i.e., depth-of-focus). Results: Commercial contact lens profiles did not give an image quality and depth-of-focus as good as the theoretically optimised optical profiles. Based on these two criteria, the best bifocal profiles were those with 5 and 8 concentric zones. Important inter-individual variations were observed for all profiles. We also observed that some subjects did not obtain any benefit with all the designs whereas others seemed to be satisfied whatever the optical profiles. Conclusion: Our previously optimised designs with 5 and 8 zones gave the best benefit and depth-of-focus. As their image quality is better than commercially available designs, it would be interesting to prototype these designs and to test them in a clinical setting.

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“…In this regard, multifocal contact lenses (MCLs) are the preferred solution over other contact lens options . Previous studies have reported that the performance of MCLs depends highly on the pupil size of the patient. Nevertheless, the pupil diameter has been reported to vary among patients within the same age range .…”

mentioning

confidence: 99%

Power profiles in multifocal contact lenses with variable multifocal zone

Monsálvez-Romín

Domínguez‐Vicent

García‐Lázaro

et al. 2018

Clinical and Experimental Optometry

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Background: The power profile of multifocal contact lenses has been demonstrated to report important information that could be used during the fitting process. The aim of this work is to describe the power profile of a recent set of gas permeable multifocal contact lenses as a function of the pupil radius. Methods: The measured multifocal contact lenses have a centre-distance design, and are available with five distance-vision diameters (XS, S, M, L and XL) and two different additions: Type A (up to +2.00 D) and Type B (up to +2.50 D). The optical device NIMO TR1504 (Lambda-X, Nivelles, Belgium) was used to obtain the power profile measurements. The optical lens power distribution as a function of the aperture radius was described in terms of radial computed colour maps, radial averaged power profiles, addition, and lens portion used for near vision. Results: The amount of total addition achieved depends on the diameter of the distancevision area. That is, the bigger the distance vision area, the bigger the radius of the lens in order to get the same level of addition. In other words, the XS lens provides higher addition values compared to the XL lens design for a given aperture. Conclusions: The XS and S designs seem to be aimed to favour near vision, whereas the L and XL designs seem to favour distance vision. For this reason, patients who demand good distance vision might benefit from the L or XL designs, and those with high demand on near-vision tasks might benefit from the XS or S designs. The M design could be the best option for those patients who have the same needs for distance and near vision.

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Optical power distribution of refractive and aspheric multifocal contact lenses: Effect of pupil size

Cited by 57 publications

References 20 publications

Soft multifocal simultaneous image contact lenses: a review

Soft multifocal simultaneous image contact lenses: a review

Simulation of commercial vs theoretically optimised contact lenses for presbyopia

Power profiles in multifocal contact lenses with variable multifocal zone

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