Spherical aberration in contact lens wear

Pettersson, Anna; Jarkö, C.; Alvin, Å.; Unsbo, Peter; Brautaset, Rune

doi:10.1016/j.clae.2008.05.005

Cited by 28 publications

(15 citation statements)

References 16 publications

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“…At all pupil diameters, SA with SACL was shifted to a more negative value than was found with the UC eye or the TFC. These results are in line with Lindskoog et al [31], who found that the aberration-controlled contact lens reduced the spherical aberration or tended to overcorrect. The results are also close to what the manufacturer claims [23] (Bausch & Lomb) over a 6 mm pupil.…”

Section: Discussionsupporting

confidence: 92%

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Clinical importance of spherical and chromatic aberration on the accommodative response in contact lens wear

Wahlberg

Pettersson

Rosén

et al. 2011

Journal of Modern Optics

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The aim of this study was to evaluate the accommodation response under both mono-and polychromatic light while varying the amount of spherical aberration. It is thought that chromatic and spherical aberrations are directional cues for the accommodative system and could affect response time, velocity or lag. Spherical aberration is often eliminated in modern contact lenses in order to enhance image quality in the unaccommodated eye. This study was divided into two parts. The first part was done to evaluate the amount of spherical and other Zernike aberrations in the unaccommodated eye when uncorrected and with two types of correction (trial lens and spherical-aberration controlled contact lens) and the second part evaluated the dynamic accommodation responses obtained when wearing each of the corrections under polychromatic and monochromatic conditions. Measurements of accommodation showed no significant differences in time, velocity and lag of accommodation after decreasing the spherical aberration with a contact lens, neither in monochromatic nor polychromatic light. It is unlikely that small to normal changes of spherical aberration in white light or monochromatic mid-spectral light affect directional cues for the accommodative system, not in white light or mid-spectral monochromatic light, since the accommodative response did not show any change.

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Section: Discussionsupporting

confidence: 92%

“…The result for spherical aberration is similar to results found in previous studies [6,[31][32][33]. At all pupil diameters, SA with SACL was shifted to a more negative value than was found with the UC eye or the TFC.…”

Section: Discussionsupporting

confidence: 92%

Clinical importance of spherical and chromatic aberration on the accommodative response in contact lens wear

Wahlberg

Pettersson

Rosén

et al. 2011

Journal of Modern Optics

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“…Aberration measurements were done in a dark room and the subjects were covered with a dark cloth to get maximum pupil size without the use of dilation. For detailed description of the aberration method, see Lindskoog Pettersson et al [34,35]. Aberration measurements were taken to evaluate the change in spherical aberration (SA) induced by the lens.…”

Section: Aberration Measurementsmentioning

confidence: 99%

Accommodation in young adults wearing aspheric multifocal soft contact lenses

Pettersson

Ramsay

Lundström

et al. 2011

Journal of Modern Optics

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The aim of the present project was to investigate accommodative behavior in young adults and adolescents fitted with an aspheric multifocal (center distance) contact lens with focus on evaluating whether these lenses can be an alternative treatment for subjects in which a reduced level of blur and thereby accommodation in near vision is aimed at. Twenty normal subjects aged between 21 and 35 years participated in the study. Aberrometry was perfomed using a Zywave TM aberrometer, first on the uncorrected eyes of all subjects, and again while the subjects wore a multifocal contact lens with a þ1.00 add. A Shin-Nippon N Vision-K 5001 Autoref-Keratometer was used to measure accommodative response with two different refractive corrections: (1) habitual spectacle correction only, and (2) habitual correction and a aspheric multifocal (center distance) contact lens. Four hours of adaptation to the lens was allowed. The lag when wearing only the habitual spectacles was compared with the lag while wearing both the habitual spectacles and the aspheric multifocal contact lens. The mean lag of accommodation for the subject group was 0.85 D (AE0.57 SD) and 0.75 D (AE0.52 SD) without and with the multifocal lens, respectively. Statistical analyses showed no difference in lag (t ¼ 0.8479, p ¼ 0.407) with and without the lens. In conclusion, young normal subjects do not relax accommodation when fitted with aspheric multifocal center distance lenses when the addition is þ1.00. It is therefore unlikely that subjects with accommodative ability, in whom the treatment purpose is to reduce blur and thereby accommodation, can be effectively treated with such lenses.

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“…Lindskoog Pettersson et al [34] investigated the on-eye spherical aberration with the PureVision. Contrary to our findings, they found an over-correction of spherical aberration in 20 eyes.…”

Section: Discussionmentioning

confidence: 99%

Spherical aberration and higher order aberrations with Balafilcon A (PureVision) and Comfilcon A (Biofinity)

McAlinden

Moore

McGilligan

et al. 2010

Graefes Arch Clin Exp Ophthalmol

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Background Advances in the optical design of soft contact lenses have seen certain manufacturers incorporate aspheric optics into soft lenses in an attempt to reduce spherical aberration, to provide superior visual performance. The aim of this study is to determine the on-eye differences in spherical aberration and higher order aberrations (HOA) between the Bausch and Lomb PureVision (Balafilcon A) and the CooperVision Biofinity (Comfilcon A). Methods Twenty subjects were recruited in a prospective, randomized, unilateral study. The right eye was dilated and HOA measured with the NIDEK OPD-Scan. Each eye was fitted randomly with a −3.00D PureVision and a −3.00D Biofinity, and HOA were measured with lenses in situ across a 6 mm pupil. Paired t-tests were performed to determine HOA differences with the lenses in situ compared to baseline.

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Spherical aberration in contact lens wear

Cited by 28 publications

References 16 publications

Clinical importance of spherical and chromatic aberration on the accommodative response in contact lens wear

Clinical importance of spherical and chromatic aberration on the accommodative response in contact lens wear

Accommodation in young adults wearing aspheric multifocal soft contact lenses

Spherical aberration and higher order aberrations with Balafilcon A (PureVision) and Comfilcon A (Biofinity)

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