Comparative study of aspheric intraocular lenses with negative spherical aberration or no aberration

Denoyer, Alexandre; Denoyer, Ludovic; Halfon, J.; Majzoub, S.; Pisella, Pierre‐Jean

doi:10.1016/j.jcrs.2008.11.032

Cited by 30 publications

(24 citation statements)

References 34 publications

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“…In addition, no improvement in photopic contrast sensitivity was observed, which is in keeping with the literature where superior contrast sensitivity has been exhibited in eyes implanted with aspheric IOLs compared with spherical IOLs, at mesopic, but not photopic conditions 3,4 …”

supporting

confidence: 86%

Clinical evaluation of the Softec HD aberration-free aspheric intraocular lens

Craig

Shah

Wolffsohn

2011

Clinical &Amp; Experimental Ophthalmology

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supporting

confidence: 86%

Clinical evaluation of the Softec HD aberration-free aspheric intraocular lens

Craig

Shah

Wolffsohn

2011

Clinical &Amp; Experimental Ophthalmology

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“…[7][8][9][10][11][12] However, at scotopic light levels a myopic shift accompanied increasing pupil radius. 7 With the now routine control of SA levels of both intraocular lenses and contact lenses, sometimes adding negative SA, [13][14][15][16][17] sometimes removing SA, 13,15,18,19 and sometimes introducing large amounts of SA to achieve multifocality, 20,21 it is timely to examine the impact of SA manipulation on spherical refractions.…”

Section: Introductionmentioning

confidence: 99%

Influence of spherical aberration, stimulus spatial frequency, and pupil apodisation on subjective refractions

Bradley

Thibos

et al. 2014

Ophthalmic Physiologic Optic

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Purpose To test competing hypotheses (Stiles Crawford pupil apodising or superior imaging of high spatial frequencies by the central pupil) for the pupil size independence of subjective refractions in the presence of primary spherical aberration. Methods Subjective refractions were obtained with a variety of test stimuli (high contrast letters, urban cityscape, high and low spatial frequency gratings) while modulating pupil diameter, levels of primary spherical aberration and pupil apodisation. Subjective refractions were also obtained with low-pass and high-pass stimuli and using “darker” and “sharper” subjective criteria. Results Subjective refractions for stimuli containing high spatial frequencies focus a near paraxial region of the pupil and are affected only slightly by level of Seidel spherical aberration, degree of pupil apodisation and pupil diameter, and generally focused a radius of about 1 to 1.5 mm from the pupil centre. Low spatial frequency refractions focus a marginal region of the pupil, and are significantly affected by level of spherical aberration, amount of pupil apodisation, and pupil size. Clinical refractions that employ the “darker” or “sharper” subjective criteria bias the patient to use lower or higher spatial frequencies respectively. Conclusions In the presence of significant levels of spherical aberration, the pupil size independence of subjective refractions occurs with or without Stiles Crawford apodisation for refractions that optimise high spatial frequency content in the image. If low spatial frequencies are optimised by a subjective refraction, spherical refractive error varies with spherical aberration, pupil size, and level of apodisation. As light levels drop from photopic to scotopic, therefore, we expect a shift from pupil size independent to pupil size dependent subjective refractions. Emphasising a “sharper” criterion during subjective refractions will improve image quality for high spatial frequencies and generate pupil size independent refractions.

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“…Most studies found better contrast sensitivity for the aspheric lens, although with different patterns. This improvement in contrast sensitivity has been associated with the improvement in night driving efficiency measured by driving simulators in some studies [46]: a fact that could better be related to the improved appreciation of peripheral targets due to the lack of night myopia. …”

Section: Effect Of Aspheric Lenses On Spherical Aberrationmentioning

confidence: 88%

An Introduction to Intraocular Lenses: Material, Optics, Haptics, Design and Aberration

Bellucci¹

2013

ESASO Course Series

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Several intraocular lens (IOL) materials and types are currently available. Polymethyl methacrylate IOLs used to be the gold standard, but the inability of folding limits their use to selected countries and patients. Silicone IOLs were used more in the past because they are less suitable for microincisions. Foldable hydrophobic acrylic is the most popular material, which is also available in yellow (blue light absorbing) models and several IOL shapes. Although a very effective and safe material, water penetration producing glistenings and some dysphotopsia has been reported with some IOL types. Foldable hydrophilic material is widely employed in Europe, and especially for microincision cataract surgery lenses because of its plasticity, even if rare optics opacification and higher posterior capsular opacification rates have been reported in the past. Single-piece IOLs are the most employed in modern cataract surgery, but 3-piece IOLs are preferred for sulcus implantation and in infants. The aspheric design to correct or to control spherical aberration in implanted eyes is now the rule after the problems of centration we had before the capsulorhexis era were solved. However, the optical quality of pseudophakic eyes will depend not only on aberration control, but also on good media transparency and low light scattering.

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Comparative study of aspheric intraocular lenses with negative spherical aberration or no aberration

Abstract: Bilateral implantation of an IOL with no aberration resulted in better quality of near vision. A negative spherical aberration IOL provided better night-driving vision and improvements in mesopic contrast sensitivity and MTF.

Cited by 30 publications

References 34 publications

Clinical evaluation of the Softec HD aberration-free aspheric intraocular lens

Clinical evaluation of the Softec HD aberration-free aspheric intraocular lens

Influence of spherical aberration, stimulus spatial frequency, and pupil apodisation on subjective refractions

An Introduction to Intraocular Lenses: Material, Optics, Haptics, Design and Aberration

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