Contrast sensitivity after implantation of a spherical versus an aspherical intraocular lens in biaxial microincision cataract surgery

Kurz, Sabine; Krummenauer, Frank; Thieme, Hagen; Dick, H. Burkhard

doi:10.1016/j.jcrs.2006.10.066

Cited by 54 publications

(51 citation statements)

References 26 publications

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“…6 Both in the laboratory by using adaptive optics 3 and in clinical studies, aspheric IOLs have been shown to reduce ocular SAs, improve contrast sensitivity, and improve night driving performance. 2,4 However, 2 recent studies 13,14 reported no differences between aspheric and spherical IOLs in low-contrast visual acuity, high-contrast visual acuity, and contrast sensitivity. Although multiple factors may contribute to these conflicting findings, lack of optimization of residual ocular SA might play a role.…”

Section: Discussionmentioning

confidence: 99%

Custom optimization of intraocular lens asphericity

Wang

Koch

2007

Journal of Cataract and Refractive Surgery

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Purpose: To investigate the optimal amount of ocular spherical aberration (SA) in an intraocular lens (IOL) to maximize optical quality.Methods: In 154 eyes of 94 patients aged 40 to 80 years, implantation of aspheric IOLs was simulated with different amounts of SA to produce residual ocular SA from -0.30 µm to +0.30 µm. Using the VOL-CT program (Sarver & Associates, Carbondale, Illinois), corneal wavefront aberrations up to 6th order were computed from corneal topographic elevation data (Humphrey Atlas, Carl Zeiss Meditec, Inc, Dublin, California). Using the ZernikeTool program (Advanced Medical Optics, Inc, Santa Ana, California), the polychromatic point spread function with Stiles-Crawford effect was calculated for the residual ocular higher-order aberrations (HOAs, 3rd to 6th order, 6-mm pupil), assuming fully corrected 2nd-order aberrations. Five parameters were used to quantify optical image quality, and we determined the residual ocular SA at which the maximal image quality was achieved for each eye. Stepwise multiple regression analysis was performed to assess the predictors for optimal SA of each eye. Results:The optimal SA varied widely among eyes. Most eyes had best image quality with low amounts of negative SA. For modulation transfer function volume up to 15 cycles/degree, the amount of optimal SA could be predicted based on other HOAs of the cornea with coefficient of multiple determination (R 2 ) of 79%. Eight Zernike terms significantly contributed to the optimal SA in this model; the order of importance to optimal SA from most to least was: Z 6 0

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Section: Discussionmentioning

confidence: 99%

Custom optimization of intraocular lens asphericity

Wang

Koch

2007

Journal of Cataract and Refractive Surgery

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“…6,7 Spherical intraocular lenses (IOLs) have positive spherical aberration that increases the total ocular spherical aberration in conjunction with that of the cornea and in turn degrades visual quality. 8 Patients with standard spherical IOLs were found to have reduced contrast sensitivity compared with that in the normal phakic population. 9 Aspheric IOLs were designed to reduce the positive spherical aberration of the cornea, improving contrast sensitivity under nonphotopic conditions over that with standard spherical IOLs.…”

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confidence: 98%

Comparison of visual performance with an aspheric intraocular lens and a spherical intraocular lens

Thiagarajan¹,

McClenaghan²,

Anderson³

2011

Journal of Cataract and Refractive Surgery

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“…Three aspheric IOL designs are currently marketed: Tecnis Z9000/2/3 (AMO), Acrysof IQ and Adapt AO. Tecnis Z9003 and Acrysof IQ produce negative spherical aberration (-0.27 and -0.20 m, respectively, measured at the 6-mm optic zone) to offset the positive spherical aberration of the average cornea [21] .…”

Section: Discussionmentioning

confidence: 99%