Predicting and Assessing Visual Performance with Multizone Bifocal Contact Lenses

Martin, Justin F.; Roorda, Austin

doi:10.1097/00006324-200312000-00011

Cited by 43 publications

(36 citation statements)

References 15 publications

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“…The optimal pupillary distribution for far and near, and the extent to what a particular design interacts with the aberration pattern of the eye has been little addressed. However, previous studies have shown that a given optical design does not produce the same optical through-focus energy distributions in all eyes (Martin & Roorda, 2003). Among other parameters in bifocal lenses, the amount of near add largely determines visual quality both in terms of visual acuity (de Gracia, and perceived image quality .…”

Section: U N C O R R E C T E D P R O O Fmentioning

confidence: 97%

“…While some studies have measured through-focus retinal image quality, generally using double-pass imaging techniques (Artal, Marcos, Navarro, Miranda, & Ferro, 1995;Kawamorita & Uozato, 2005;Navarro, Ferro, Artal, & Miranda, 1993) or visual quality (Gupta, Naroo, & Wolffsohn, 2009;Maxwell, Lane, & Zhou, 2009;Schmidinger et al, 2006;Woods, Woods, & Fonn, 2015), these are generally restricted to patients implanted or fitted with commercial lenses, and therefore limited to specific conditions. Most of the systematic evaluations of many of the available lenses are limited to optical computer simulations and on bench experiments, therefore lacking from the optical and the neural complexity of a patient (Martin & Roorda, 2003).…”

Section: U N C O R R E C T E D P R O O Fmentioning

confidence: 99%

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Testing vision with angular and radial multifocal designs using Adaptive Optics

et al. 2017

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Multifocal vision corrections are increasingly used solutions for presbyopia. In the current study we have evaluated, optically and psychophysically, the quality provided by multizone radial and angular segmented phase designs. Optical and relative visual quality were evaluated using 8 subjects, testing 6 phase designs. Optical quality was evaluated by means of Visual Strehl-based-metrics (VS). The relative visual quality across designs was obtained through a psychophysical paradigm in which images viewed through 210 pairs of phase patterns were perceptually judged. A custom-developed Adaptive Optics (AO) system, including a Hartmann-Shack sensor and an electromagnetic deformable mirror, to measure and correct the eye's aberrations, and a phase-only reflective Spatial Light Modulator, to simulate the phase designs, was developed for this study. The multizone segmented phase designs had 2-4 zones of progressive power (0 to +3D) in either radial or angular distributions. The response of an "ideal observer" purely responding on optical grounds to the same psychophysical test performed on subjects was calculated from the VS curves, and compared with the relative visual quality results. Optical and psychophysical pattern-comparison tests showed that while 2-zone segmented designs (angular & radial) provided better performance for far and near vision, 3-and 4-zone segmented angular designs performed better for intermediate vision. AO-correction of natural aberrations of the subjects modified the response for the different subjects but general trends remained. The differences in perceived quality across the different multifocal patterns are, in a large extent, explained by optical factors. AO is an excellent tool to simulate multifocal refractions before they are manufactured or delivered to the patient, and to assess the effects of the native optics to their performance.

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Section: U N C O R R E C T E D P R O O Fmentioning

confidence: 97%

Section: U N C O R R E C T E D P R O O Fmentioning

confidence: 99%

Testing vision with angular and radial multifocal designs using Adaptive Optics

et al. 2017

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“…In addition to routine contact lens fit data (including pupil size), ocular aberrations may also influence presbyopic contact lens performance and acceptance [5][6][7]. Simultaneous image design multifocal contact lenses induce concentric zones of varying power or transition in power within the pupil, altering aberrations [8].…”

Section: Introductionmentioning

confidence: 99%

Investigating the utility of clinical assessments to predict success with presbyopic contact lens correction

Sivardeen

Laughton

Wolffsohn

2016

Contact Lens and Anterior Eye

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2 Abstract Purpose:To determine the utility of a range of clinical and non-clinical indicators to aid the initial selection of the optimum presbyopic contact lens. In addition, to assess whether lens preference was influenced by the visual performance compared to the other designs trialled (intrasubject) or compared to participants who preferred other designs (inter-subject). Methods:A double-masked randomised crossover trial of Air Optix Aqua multifocal, PureVision 2 for Presbyopia, Acuvue OASYS for Presbyopia, Biofinity multifocal and monovision was conducted on 35 presbyopes (54.3±6.2 years). Participant lifestyle, personality, pupil characteristics and aberrometry were assessed prior to lens fitting. After 4 weeks of wear, high and low contrast visual acuity (VA) under photopic and mesopic conditions, reading speed, Near Activity Visual Questionnaire (NAVQ) rating, subjective quality-of-vision scoring, defocus curves, stereopsis, halometry, aberrometry and ocular physiology were quantified. Results:After trialling all the lenses, preference was mixed (n=12 Biofinity, n=10 monovision, n=7 Purevision, n=4 Air Optix Aqua, n=2 Oasys). Lens preference was not dependent on personality Conclusions: Participant lifestyle and personality, ocular optics, contact lens visual performance and ocular physiology provided poor indicators of the preferred lens type after 4 weeks of wear. This is confounded by the wide range of task visual demands of presbyopes and the limited optical differences between current multifocal contact lens designs.

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“…Ocular aberrometry has been used for studying ocular properties as a function of accommodation [1], aging [2,3], or refractive error [4], as well as for the assessment of refractive correction techniques (refractive surgery [5,6], cataract surgery [7,8], and contact lenses [9][10][11]), or the correction of ocular aberrations to visualize the eye fundus [12][13][14]. The evaluation of the optical outcomes of refractive surgery has led to an increasing importance of aberrometry in recent years, and commercial aberrometers are now commonly used to assist in surgery [15,16].…”

Section: Introductionmentioning

confidence: 99%

Effect of sampling on real ocular aberration measurements

et al. 2007

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The minimum number of samples necessary to fully characterize the aberration pattern of the eye is a question under debate in the clinical as well as the scientific community. We performed repeated measurements of ocular aberrations in 12 healthy nonsurgical human eyes and in 3 artificial eyes, using different sampling patterns (hexagonal, circular, and rectangular with 19 to 177 samples, and 3 radial patterns with 49 sample coordinates corresponding to zeros of the Albrecht, Jacobi, and Legendre functions). For each measurement set we computed two different metrics based on the rootmean-square (RMS) of difference maps (RMS_Diff) and the proportional change in the wavefront (W%). These metrics are used to compare wavefront estimates as well as to summarize results across eyes. We used computer simulations to extend our results to "abnormal eyes" (keratoconic, post-LASIK, and post-radial keratotomy eyes). We found that the spatial distribution of the samples can be more important than the number of samples for both our measured as well as our simulated "abnormal" eyes. Experimentally, we did not find large differences across patterns except, as expected, for undersampled patterns.

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Predicting and Assessing Visual Performance with Multizone Bifocal Contact Lenses

Abstract: Bifocal contact lens designs, when combined with the aberrations of the eye, will not always provide bifocal vision. Visual quality with a bifocal contact lens can be predicted based on a patient's ocular aberrations.

Cited by 43 publications

References 15 publications

Testing vision with angular and radial multifocal designs using Adaptive Optics

Testing vision with angular and radial multifocal designs using Adaptive Optics

Investigating the utility of clinical assessments to predict success with presbyopic contact lens correction

Effect of sampling on real ocular aberration measurements

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