Interaction between aberrations to improve or reduce visual performance

Applegate, Raymond A.; Marsack, Jason D; Ramos, R González; Sarver, Edwin J.

doi:10.1016/s0886-3350(03)00334-1

Cited by 355 publications

(278 citation statements)

References 19 publications

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“…Although the grading system has a 0 score, the mean density is 9.3% and the maximum density is 25.5%. 21,22 reported that aberrations located in the central and upper areas of the Zernike pyramid tend to cause greater visual quality distortion. We included the internal HOAs because the crystalline lens is responsible for the increase in ocular aberrations that occurs with aging.…”

Section: Discussionmentioning

confidence: 99%

Scheimpflug lens densitometry and ocular wavefront aberrations in patients with mild nuclear cataract

Faria-Correia¹,

Lopes²,

Monteiro³

et al. 2016

Journal of Cataract and Refractive Surgery

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PURPOSE:To test correlations between Scheimpflug optical densitometry and ocular higher-order aberrations (HOAs) in patients with mild nuclear cataract.SETTING: Cornea and Refractive Surgery Department, Hospital de Braga, Braga, Portugal. DESIGN:Retrospective single-center study. METHODS:In eyes with mild nuclear cataract, lens densitometry was evaluated by Scheimpflug imaging (Pentacam HR), which provided an objective quantification (mean density and maximum density) and grading (nuclear staging score) of the crystalline lens. A visual function analyzer that combines ray-tracing aberrometry and Placido disk-based topography (iTrace) was used to evaluate the total ocular and internal HOAs. RESULTS:The study comprised 40 eyes of 30 patients. The mean density of the lens nucleus was 8.99% G 0.76% (SD) (range 7.5% to 10.8%), and the mean maximum density was 27.96% G 6.97% (range 16.9% to 56.1%). Regarding the score of nuclear staging of the Scheimpflug device, 28 eyes had level 0 and 12 eyes had level 1. Significant positive correlations were found between the mean density and maximum density parameters and the internal HOAs (r Z 0.661, P < .001 and r Z 0.570, P < .001, respectively).CONCLUSIONS: There were significant correlations between the quantification parameters derived from Scheimpflug lens densitometry and ocular HOAs. The integration of these technologies can help in clinical decision making and in understanding the subjective symptoms of patients with mild nuclear cataracts.

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Section: Discussionmentioning

confidence: 99%

Scheimpflug lens densitometry and ocular wavefront aberrations in patients with mild nuclear cataract

Faria-Correia¹,

Lopes²,

Monteiro³

et al. 2016

Journal of Cataract and Refractive Surgery

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“…This demonstrates aberration interactions among Zernike terms as reported by Applegate and colleagues. 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.…”

Section: Discussionmentioning

confidence: 99%

“…5 Applegate and colleagues 6 have reported that aberrations in different Zernike terms interact to increase or decrease optical performance. It is unclear what the optimal amount of SA would be in eyes with various HOAs.…”

Section: Introductionmentioning

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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“…[70][71][72][73][74][75] It would be expected that, at any pupil diameter, lower levels of HOAs are associated with better distance visual performance, although it is known that similar levels of root-mean-square (RMS) wavefront aberrations distributed between different Zernike coefficients do not necessarily imply equal performance. 76,77 Several studies evaluated the optical performance after hybrid multifocal IOL implantation. Souza and colleagues, 27 Rocha and co-workers 45 and Ortiz and associates 78 studied the optical performance of the AcrySof ReSTOR IOL and compared it with a monofocal IOL.…”

Section: Wavefront Aberrationsmentioning

confidence: 99%

Visual and optical performance with hybrid multifocal intraocular lenses

Madrid-Costa

Cerviño

Ferrer-Blasco

et al. 2010

Clinical and Experimental Optometry

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During the past years, the wish to become independent of spectacles has been growing among cataract and presbyopic patients due to many factors, such as the increase in near visual demands, the aesthetic need for a spectacle-free image and ageing of refractive surgery patients, among others. This review assesses recently published studies that analyse visual and optical performance through different metrics of eyes implanted with multifocal intraocular lenses (IOLs), particularly hybrid IOL designs. The published evidence suggests that hybrid multifocal IOLs provide very good outcomes in a number of visual and optical performance parameters. Patients implanted with this type of IOL obtain a satisfactory full range of visual functions, including patients of particular characteristics such as highly ametropic or post-LASIK.

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Interaction between aberrations to improve or reduce visual performance

Cited by 355 publications

References 19 publications

Scheimpflug lens densitometry and ocular wavefront aberrations in patients with mild nuclear cataract

Scheimpflug lens densitometry and ocular wavefront aberrations in patients with mild nuclear cataract

Custom optimization of intraocular lens asphericity

Visual and optical performance with hybrid multifocal intraocular lenses

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