Depth of focus after implantation of spherical or aspheric intraocular lenses in hyperopic and emmetropic patients

Steinwender, Gernot; Strini, Sanja; Glatz, Wilfried; Schwantzer, Gerold; Vidic, B.; Findl, Oliver; Wedrich, Andreas; Ardjomand, Navid

doi:10.1016/j.jcrs.2017.08.012

Cited by 12 publications

(7 citation statements)

References 22 publications

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“…Previous studies reported that spherical IOLs improve through-focus visual acuity compared to an aspheric monofocal IOL due to the increase of the total primary spherical aberration of the eye. 16,17 However, the effect of primary spherical aberration in through-focus performance is strongly dependent on pupil size and is associated with losses in contrast vision at distance. For large pupils, primary spherical aberration increases the depth of focus and reduces distance image quality.…”

Section: Discussionmentioning

confidence: 99%

Enhancing the Intermediate Vision of Monofocal Intraocular Lenses Using a Higher Order Aspheric Optic

Alarcón¹,

Cánovas²,

Koopman³

et al. 2020

J Refract Surg

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B efore the introduction of the aspheric technology, the standard of care was the use of monofocal spherical intraocular lenses (IOLs) that have spherical optical surfaces that are well known to induce (positive) primary spherical aberration. The spherical aberration of spherical IOLs adds to the spherical aberration originating from the cornea, increasing the total spherical aberration of the eye and limiting the distance image quality of the pseudophakic eye. 1-3 Aspheric IOLs have been developed to either compensate for the lens' intrinsic spherical aberration ("aberration neutral" or "zero aberration" IOLs) or the corneal spherical aberration (aberration-correcting IOL). 3 Previous studies have shown that aspheric IOLs that fully ABSTRACT PURPOSE: To describe and evaluate a new monofocal intraocular lens (IOL) designed to improve intermediate vision using a unique refractive technology. METHODS: The new monofocal lens is based on a higher order aspheric optic and is designed to improve intermediate vision. Simulated visual acuity from far to-2.00 diopters (D) was calculated using optical bench data. The effect of corneal higher order aberrations (HOAs) on simulated visual acuity, pupil size, and decentration was assessed using realistic computer eye models. The susceptibility to photic phenomena was evaluated by measuring preclinically the intensity of the light distribution in the retinal plane. The new lens design was compared to a standard aspheric monofocal IOL that shares the same platform, material, and primary spherical aberration as the new design. RESULTS: Simulated defocus curves showed increased simulated visual acuity in the intermediate range compared to a standard aspheric monofocal IOL with comparable distance vision, independently of the pupil size and corneal HOAs. At-1.50 D, the new IOL design provided a gain of approximately 0.1 logMAR, whereas at distance, the difference was less than 0.05 logMAR. The tolerance to decentration was also similar in both designs. Finally, experimental results indicate that the susceptibility to photic phenomena with the new lens design was similar to that of a standard aspheric monofocal IOL. CONCLUSIONS: Preclinical data showed that the new lens design improves intermediate vision while maintaining comparable distance image quality and keeping the same photic phenomena profile as a standard aspheric monofocal IOL.

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Section: Discussionmentioning

confidence: 99%

Enhancing the Intermediate Vision of Monofocal Intraocular Lenses Using a Higher Order Aspheric Optic

Alarcón¹,

Cánovas²,

Koopman³

et al. 2020

J Refract Surg

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“…Alterations to the light adjustable IOL once implanted in the eye through UV radiation patterns can also create an EDOF effect (Villegas et al, 2014). There is also a pinhole iris-fixated IOL specifically designed to reduce dysphotopsia and photophobia (Munoz et al, 2015), which will extend the depth of focus as will any aspheric design (Steinwender et al, 2017). Hence, in 2016, the American Academy of Ophthalmology Task Force Consensus Statement on EDOF IOLs was published to provide minimum performance criteria to evaluate a device as having an EDOF performance under photopic, mesopic, and glare conditions based on testing vision at far and intermediate distances as well as defocus curve testing (MacRae et al, 2017).…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Presbyopia: Effectiveness of correction strategies

Wolffsohn

Davies

2019

Progress in Retinal and Eye Research

232

178

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Presbyopia is a global problem affecting over a billion people worldwide. The prevalence of unmanaged presbyopia is as high as 50% of those over 50 years of age in developing world populations, due to a lack of awareness and accessibility to affordable treatment, and is even as high as 34% in developed countries. Definitions of presbyopia are inconsistent and varied, so we propose a redefinition that states "presbyopia occurs when the physiologically normal age-related reduction in the eye's focusing range reaches a point, when optimally corrected for distance vision, that the clarity of vision at near is insufficient to satisfy an individual's requirements". Strategies for correcting presbyopia include separate optical devices located in front of the visual system (reading glasses) or a change in the direction of gaze to view through optical zones of different optical powers (bifocal, trifocal or progressive addition spectacle lenses), monovision (with contact lenses, intraocular lenses, laser refractive surgery and corneal collagen shrinkage), simultaneous images (with contact lenses, intraocular lenses and corneal inlays), pinhole depth of focus expansion (with intraocular lenses, corneal inlays and pharmaceuticals), crystalline lens softening (with lasers or pharmaceuticals) or restored dynamics (with 'accommodating' intraocular lenses, scleral expansion techniques and ciliary muscle electrostimulation); these strategies may be applied differently to the two eyes to optimise the range of clear focus for an individual's task requirements and minimise adverse visual effects. However, none fully overcome presbyopia in all patients. While the restoration of natural accommodation or an equivalent remains elusive, guidance is given on presbyopic correction evaluation techniques.

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“…We eschewed an aspheric IOL because we surmised that positive spherical aberration supplied by a spherical IOL could have favourable effects on depth of field and intermediate vision while maintaining distance visual acuity and therefore increase binocular summation over a larger range of vision. 11,12 Thus, a spherical IOL may be paired with an EDOF-IOL, as the latter IOL provides an even greater depth of field. While spherical IOLs may have fallen out of favour for routine cataract surgery in modern practice, these properties mentioned above merit (re)consideration for their utility for presbyopia correction in conjunction with currently-available IOLs.…”

Section: Visual Acuitymentioning

confidence: 99%

Unilateral intraindividual comparison and bilateral performance of a monofocal spherical and diffractive extended depth of field intraocular lens mix‐and‐match approach

Wendelstein,

Casazza,

Reifeltshammer

et al. 2023

Clinical Exper Ophthalmology

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BackgroundTo evaluate the intraindividual visual performance of a spherical and extended depth of field (EDOF) IOL used in a mix‐and‐match approach.MethodsSingle centre (tertiary care centre), retrospective consecutive case series. Included patients had uneventful cataract surgery with implantation of a spherical monofocal IOL (CT Spheris 204) in the dominant eye and a diffractive EDOF IOL (AT LARA 829) in the non‐dominant eye. Monocular and binocular defocus curves and visual acuity at various distances were assessed. In addition, binocular reading speed, contrast sensitivity, and patient satisfaction using QOV, Catquest 9SF, and glare/halo questionnaires are reported.ResultsA total of 29 patients (58 eyes) were included. We observed significant intra‐individual differences for monocular DCIVA, DCNVA, UIVA, and UNVA. There were no differences in monocular BCDVA or UDVA. The monocular defocus curves for the two IOLs significantly differed at defocus steps between −1.0 and −3.5 D. 93.10% of patients reported they would opt for the same combination of IOLs.ConclusionExcellent uncorrected and corrected distance visual acuity was demonstrated in both groups. The mix‐and‐match approach described in this study yielded good intermediate vision and improved near vision with high‐patient satisfaction.

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Depth of focus after implantation of spherical or aspheric intraocular lenses in hyperopic and emmetropic patients

Abstract: Implantation of a monofocal spherical IOL resulted in an increased depth of focus without significant degradation of distance visual acuity or contrast sensitivity. There were no differences in the depth of focus between hyperopic eyes and emmetropic eyes.

Cited by 12 publications

References 22 publications

Enhancing the Intermediate Vision of Monofocal Intraocular Lenses Using a Higher Order Aspheric Optic

Enhancing the Intermediate Vision of Monofocal Intraocular Lenses Using a Higher Order Aspheric Optic

Presbyopia: Effectiveness of correction strategies

Unilateral intraindividual comparison and bilateral performance of a monofocal spherical and diffractive extended depth of field intraocular lens mix‐and‐match approach

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