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multifocal iol calculation

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https://www.readbyqxmd.com/read/27785598/pseudo-accommodation-in-non-amblyopic-children-after-bilateral-cataract-surgery-and-implantation-with-a-monofocal-intraocular-lens-prevalence-and-possible-mechanisms
#1
Charlotte Dénier, Pascal Dureau, Catherine Edelson, Amandine Barjol, Georges Caputo
BACKGROUND: Some pseudophakic patients implanted with a monofocal intraocular lens (IOL) have good near visual acuity (VA) with their distance correction. The objective was to evaluate the prevalence of pseudo-accommodation in children after bilateral cataract surgery, without amblyopia, and to define its mechanisms. METHODS: Observational study that took place in a pediatric ophthalmology department, Paris, France. A total of 68 eyes were included, 40 from 23 children and 28 from 14 adults, with a corrected distance VA above 20/25 and a normal near VA (20/25) with +3 addition...
October 26, 2016: Graefe's Archive for Clinical and Experimental Ophthalmology
https://www.readbyqxmd.com/read/27697245/differences-in-visual-quality-with-orientation-of-a-rotationally-asymmetric-bifocal-intraocular-lens-design
#2
Aiswaryah Radhakrishnan, Carlos Dorronsoro, Susana Marcos
PURPOSE: To evaluate visual and perceptual performance for different orientations of a rotationally asymmetric bifocal intraocular lens (IOL) (M-Plus) simulated optically using a simultaneous vision simulator. SETTING: Instituto de Optica, Madrid, Spain. DESIGN: Prospective observational study. METHODS: Perceptual quality and decimal high-contrast visual acuity (HCVA) was measured under cycloplegia for 8 orientations of the asymmetric bifocal IOL phase pattern at far, intermediate, and near distances simulated with a simultaneous vision simulator using face images and tumbling E targets...
September 2016: Journal of Cataract and Refractive Surgery
https://www.readbyqxmd.com/read/27255256/assessing-the-in%C3%A2-vitro-optical-quality-of%C3%A2-presbyopic-solutions-based-on-the-axial%C3%A2-modulation-transfer-function
#3
Eleni Papadatou, Antonio J Del Águila-Carrasco, José J Esteve-Taboada, David Madrid-Costa, Robert Montés-Micó
PURPOSE: To present a metric for assessing the in vitro optical quality of rotationally symmetrical optical elements based on volume calculation under the surface defined by the axial modulation transfer function (MTF). SETTING: University of Valencia, Valencia, Spain. DESIGN: Experimental study. METHODS: The metric volume under the axial MTF was used to assess the optical quality of 2 rotationally symmetrical multifocal intraocular lenses (IOLs) within various defocus intervals (0...
May 2016: Journal of Cataract and Refractive Surgery
https://www.readbyqxmd.com/read/27231628/preclinical-metrics-to-predict-through-focus-visual-acuity-for-pseudophakic-patients
#4
Aixa Alarcon, Carmen Canovas, Robert Rosen, Henk Weeber, Linda Tsai, Kendra Hileman, Patricia Piers
This study compares the clinical through-focus visual acuity (VA) in patients implanted with different intraocular lens (IOL) to optical bench testing of the same IOLs to evaluate the suitability of optical metrics of predicting clinical VA. Modulation transfer function and phase transfer function for different spatial frequencies and US Air Force pictures were measured using an optical bench for two monofocal IOLs, three multifocal IOLs and an extended range of vision IOL. Four preclinical metrics were calculated and compared to the clinical through-focus VA collected in three different clinical studies (243 patients in total)...
May 1, 2016: Biomedical Optics Express
https://www.readbyqxmd.com/read/26948777/influence-of-the-effective-lens-position-as-predicted-by-axial-length-and-keratometry-on-the-near-add-power-of-multifocal-intraocular-lenses
#5
Giacomo Savini, Kenneth J Hoffer, Marco Lombardo, Sebastiano Serrao, Domenico Schiano-Lomoriello, Pietro Ducoli
PURPOSE: To calculate the near focal distance of different multifocal intraocular lenses (IOLs) as a function of the 2 parameters that are measured before cataract surgery; that is, axial length (AL) and refractive corneal power (keratometry [K]). SETTING: GB Bietti Foundation IRCCS, Rome, Italy. DESIGN: Noninterventional theoretical study. METHODS: The IOL power for emmetropia was first calculated in an eye model with the AL ranging from 20 to 30 mm and K from 38 to 48 diopters (D)...
January 2016: Journal of Cataract and Refractive Surgery
https://www.readbyqxmd.com/read/26469074/effect-of-large-apertures-on-the-optical-quality-of-three-multifocal-lenses
#6
COMPARATIVE STUDY
Jose Juan Esteve-Taboada, Alberto Domínguez-Vicent, Antonio J Del Águila-Carrasco, Teresa Ferrer-Blasco, Robert Montés-Micó
PURPOSE: To compare the optical quality under large apertures among three multifocal intraocular lenses (IOLs): the TECNIS Symfony ZXR00 (Abbott Laboratories, Abbott Park, IL), the AT LISA tri 839MP (Carl Zeiss Meditec, Jena, Germany), and the Finevision (PhysIOL, Liège, Belgium). METHODS: The in vitro optical quality of each lens was assessed with an instrument that measured the modulation transfer function (MTF). The optical quality of each lens was described in terms of MTF and through focus average MTF...
October 2015: Journal of Refractive Surgery
https://www.readbyqxmd.com/read/26469073/influence-on-visual-quality-of-intraoperative-orientation-of-asymmetric-intraocular-lenses
#7
Sergio Bonaque-González, Susana Ríos, Alfredo Amigó, Norberto López-Gil
PURPOSE: To evaluate visual quality when changing the intraocular orientation of the Lentis Mplus LS-312MF nonrotational symmetric +3.00 diopters aspheric multifocal intraocular lens ([IOL] Oculentis GmbH, Berlin, Germany) in normal eyes. METHODS: An artificial eye was used to measure the in vitro wavefront of the IOL. The corneal topography of 20 healthy patients was obtained. For each eye, a computational analysis simulated the implantation of the IOL. The modulation transfer function (MTF) and an image quality parameter (visually modulated transfer function [VSMTF] metric) were calculated for a 5...
October 2015: Journal of Refractive Surgery
https://www.readbyqxmd.com/read/26085998/error-induced-by-the-estimation-of-the-corneal-power-and-the-effective-lens-position-with-a-rotationally-asymmetric-refractive-multifocal-intraocular-lens
#8
David P Piñero, Vicente J Camps, María L Ramón, Verónica Mateo, Rafael J Pérez-Cambrodí
AIM: To evaluate the prediction error in intraocular lens (IOL) power calculation for a rotationally asymmetric refractive multifocal IOL and the impact on this error of the optimization of the keratometric estimation of the corneal power and the prediction of the effective lens position (ELP). METHODS: Retrospective study including a total of 25 eyes of 13 patients (age, 50 to 83y) with previous cataract surgery with implantation of the Lentis Mplus LS-312 IOL (Oculentis GmbH, Germany)...
2015: International Journal of Ophthalmology
https://www.readbyqxmd.com/read/25884577/image-quality-comparison-of-two-multifocal-iols-influence-of-the-pupil
#9
COMPARATIVE STUDY
Mari Carmen García-Domene, Adelina Felipe, Cristina Peris-Martínez, Amparo Navea, Jose M Artigas, Álvaro M Pons
PURPOSE: To evaluate the effect of pupil size on image quality of a sectorial multifocal intraocular lens (IOL), the Lentis Mplus (Oculentis GmbH, Berlin, Germany), and the Acri.LISA IOL (Carl Zeiss Meditec, Jena, Germany). METHODS: The authors measured the MTFs of the Lentis Mplus LS-312 IOL and the Acri.LISA 366D IOL with three different sizes of pupil diameters: 3, 4, and 5 mm. The MTF was calculated from the cross-line spread function recorded with the OPAL Vector System (Image Science Ltd...
April 2015: Journal of Refractive Surgery
https://www.readbyqxmd.com/read/25735041/evaluation-of-rotation-and-visual-outcomes-after-implantation-of-monofocal-and-multifocal-toric-intraocular-lenses
#10
COMPARATIVE STUDY
Nuria Garzón, Francisco Poyales, Begoña Ortíz de Zárate, Jose Luis Ruiz-García, Juan Antonio Quiroga
PURPOSE: To evaluate rotational stability and its influence on postoperative visual acuity of different monofocal and multifocal toric intraocular lenses (IOLs). METHODS: A prospective interventional study was designed. Ninety-one patients with a mean age of 71.65 ± 11.82 years were implanted with toric IOLs after phacoemulsification. Three monofocal toric IOLs (the Lentis LT [Oculentis, Berlin, Germany], enVista [Bausch & Lomb, Rochester, NY], and AcrySof IQ [Alcon Laboratories, Inc...
February 2015: Journal of Refractive Surgery
https://www.readbyqxmd.com/read/25626855/multifocal-versus-monofocal-intraocular-lenses-after-cataract-extraction
#11
COMMENT
Daniel Calladine, Jennifer R Evans, Sweata Shah, Martin Leyland
BACKGROUND: Good unaided distance visual acuity is now a realistic expectation following cataract surgery and intraocular lens (IOL) implantation. Near vision, however, still requires additional refractive power, usually in the form of reading glasses. Multiple optic (multifocal) IOLs are available which claim to allow good vision at a range of distances. It is unclear whether this benefit outweighs the optical compromises inherent in multifocal IOLs. OBJECTIVES: The objective of this review was to assess the effects of multifocal IOLs, including effects on visual acuity, subjective visual satisfaction, spectacle dependence, glare and contrast sensitivity, compared to standard monofocal lenses in people undergoing cataract surgery...
February 2015: São Paulo Medical Journal, Revista Paulista de Medicina
https://www.readbyqxmd.com/read/25491591/accuracy-of-predicted-refraction-with-multifocal-intraocular-lenses-using-two-biometry-measurement-devices-and-multiple-intraocular-lens-power-calculation-formulas
#12
COMPARATIVE STUDY
Olga Reitblat, Ehud I Assia, Guy Kleinmann, Adi Levy, Graham D Barrett, Adi Abulafia
BACKGROUND: To evaluate the accuracy of predicted refraction using multifocal intraocular lenses (IOLs) with power calculation based on two biometric devices and multiple IOL power calculation formulas. DESIGN: A retrospective study conducted in a private practice ophthalmology clinic. PARTICIPANTS: Seventy-three eyes of 48 patients were evaluated. METHODS: Consecutive cases of eyes that had undergone successful cataract surgery with an implantation of a multifocal IOL (SN6AD1, Alcon Laboratories, Inc...
May 2015: Clinical & Experimental Ophthalmology
https://www.readbyqxmd.com/read/25465690/impact-of-intraocular-lens-material-and-design-on-light-scatter-in-vitro-study
#13
COMPARATIVE STUDY
Michelle J M Langeslag, Marrie van der Mooren, George H H Beiko, Patricia A Piers
PURPOSE: To determine the typical in vitro straylight levels for intraocular lenses (IOLs) of different materials and designs. SETTING: Abbott Medical Optics, Inc., Groningen, the Netherlands. DESIGN: Experimental study. METHODS: Two optical bench setups were used to determine baseline straylight levels of IOLs placed in a saline-filled cuvette: one for forward scatter positions between 0.6 and 3.0 degrees and one for positions up to 22...
December 2014: Journal of Cataract and Refractive Surgery
https://www.readbyqxmd.com/read/25146366/cost-effectiveness-comparison-between-monofocal-and-multifocal-intraocular-lens-implantation-for-cataract-patients-in-taiwan
#14
COMPARATIVE STUDY
Jen-Chieh Lin, Ming-Chin Yang
PURPOSE: Our aim was to conduct a cost-effectiveness analysis (CEA) of monofocal and multifocal intraocular lenses (IOLs) for cataract patients in Taiwan. METHODS: This prospective nonrandomized study was designed to evaluate the effectiveness of monofocal and multifocal IOLs by means of visual performance, visual quality, vision-related quality of life, and spectacle-independence rates. The direct costs were calculated using the payment points of the fee schedule for medical services multiplied by the treatment items...
October 1, 2014: Clinical Therapeutics
https://www.readbyqxmd.com/read/25127929/refractive-lens-exchange
#15
REVIEW
Jorge L Alio, Andrzej Grzybowski, Amr El Aswad, Dorota Romaniuk
Advances in small incision surgery have enabled cataract surgery to evolve from being concerned primarily with the safe removal of the opaque crystalline lens to a procedure refined to yield the best possible postoperative refractive result. As the outcomes of cataract surgery have improved, the use of lens surgery as a refractive modality in patients without cataracts (clear lens extraction) has increased in popularity. The removal of the crystalline lens for refractive purposes, or so-called refractive lens exchange (RLE), offers distinct advantages over corneal refractive surgery in selected cases...
November 2014: Survey of Ophthalmology
https://www.readbyqxmd.com/read/24669143/gradient-refractive-index-optics-iol-theoretical-background-and-clinical-results
#16
Boris Malyugin, Tatiana Morozova, Valentin Cherednik
PURPOSE: To present the theoretical optical background and clinical results of a new multifocal intraocular lens (MIOL) concept-gradient refractive index optics (Gradiol). PATIENTS AND METHODS: Original mathematical modeling software was used to calculate optimal construction of the MIOL optic constructed from two polymer materials with different refractive indices. Gradiol lenses were manufactured from hydrophobic acrylic utilizing original step-by-step polymerization technology with the final power difference of of 3...
January 2014: Middle East African Journal of Ophthalmology
https://www.readbyqxmd.com/read/24195051/visual-function-and-higher-order-aberration-after-implantation-of-aspheric-and-spherical-multifocal-intraocular-lenses-a-meta-analysis
#17
Jian-Ping Liu, Fan Zhang, Jiang-Yue Zhao, Li-Wei Ma, Jin-Song Zhang
AIM: To assess the visual outcomes of aspheric multifocal intraocular lenses (IOLs) compared with spherical multifocal IOL after cataract surgery. METHODS: Potential prospective controlled trials that comparing aspheric multifocal IOL implantation with spherical multifocal IOL group were extracted from the computer database. The statistical analysis was carried out using Stata 10 software. Standardized mean differences with 95% confidence intervals (CIs) were calculated for continuous variables...
2013: International Journal of Ophthalmology
https://www.readbyqxmd.com/read/23960962/challenges-and-approaches-in-modern-biometry-and-iol-calculation
#18
Wolfgang Haigis
The introduction of new intraocular lenses (IOLs), industry marketing to the public and patient expectations has warranted increased accuracy of IOL power calculations. Toric IOLs, multifocal IOLs, aspheric IOLs, phakic lenses, accommodative lenses, cases of refractive lens exchange and eyes that have undergone previous refractive surgery all require improved clinical measurements and IOL prediction formulas. Hence, measurement techniques and IOL calculation formulas are essential factors that affect the refractive outcome...
January 2012: Saudi Journal of Ophthalmology: Official Journal of the Saudi Ophthalmological Society
https://www.readbyqxmd.com/read/23932105/piggyback-multifocal-iols-for-a-hyperopic-presbyopic-surprise-after-cataract-surgery-in-high-myopic-patients
#19
Valentín Huerva
PURPOSE: To demonstrate the utility of piggyback multifocal intraocular lenses (IOLs) for a hyperopic-presbyopic surprise after cataract surgery in highly myopic patients. METHODS: Case report. RESULTS: A 43-year-old woman with high myopia presented with dense subcapsular cataracts. The IOL power calculated with the Haigis formula gave a lens of -7D for emmetropia in the right eye. The refractive result was a spherical equivalent refractive error of +2...
February 2014: Contact Lens & Anterior Eye: the Journal of the British Contact Lens Association
https://www.readbyqxmd.com/read/23688874/exploring-the-optimum-step-size-for-defocus-curves
#20
James S Wolffsohn, Amit N Jinabhai, Alec Kingsnorth, Amy L Sheppard, Shehzad A Naroo, Sunil Shah, Phillip Buckhurst, Lee A Hall, Graeme Young
PURPOSE: To evaluate the effect of reducing the number of visual acuity measurements made in a defocus curve on the quality of data quantified. SETTING: Midland Eye, Solihull, United Kingdom. DESIGN: Evaluation of a technique. METHODS: Defocus curves were constructed by measuring visual acuity on a distance logMAR letter chart, randomizing the test letters between lens presentations. The lens powers evaluated ranged between +1...
June 2013: Journal of Cataract and Refractive Surgery
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