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https://www.readbyqxmd.com/read/27905889/influence-of-posterior-corneal-astigmatism-on-postoperative-refractive-astigmatism-in-pseudophakic-eyes-after-cataract-surgery
#1
Maki Sano, Takahiro Hiraoka, Yuta Ueno, Hideo Itagaki, Tomohiro Ogami, Tetsuro Oshika
BACKGROUND: To examine the influence of posterior corneal astigmatism on postoperative refractive astigmatism in pseudophakic eyes after cataract surgery. METHODS: The study enrolled 64 pseudophakic eyes of 50 patients (71.8 ± 9.9 years old, mean ± standard deviation) who had undergone phacoemulsification with non-toric IOL implantation. Refractive astigmatism was measured using an auto ref-keratometer with a 0.01- diopter (D) scale. Two types of corneal astigmatism were calculated using anterior segment optical coherence tomography; keratometric and total corneal astigmatism...
December 1, 2016: BMC Ophthalmology
https://www.readbyqxmd.com/read/27846894/corneal-power-evaluation-after-myopic-corneal-refractive-surgery-using-artificial-neural-networks
#2
Robert Koprowski, Michele Lanza, Carlo Irregolare
BACKGROUND: Efficacy and high availability of surgery techniques for refractive defect correction increase the number of patients who undergo to this type of surgery. Regardless of that, with increasing age, more and more patients must undergo cataract surgery. Accurate evaluation of corneal power is an extremely important element affecting the precision of intraocular lens (IOL) power calculation and errors in this procedure could affect quality of life of patients and satisfaction with the service provided...
November 15, 2016: Biomedical Engineering Online
https://www.readbyqxmd.com/read/27843355/retropupilar-positioning-of-foldable-iris-claw-intraocular-lens-for-correction-of-aphakia-with-no-capsular-support
#3
Mun Yueh Faria, Nuno Pinto Ferreira, Ivo Gama, Joana Medeiros Pinto, Mario Canastro, Manuel Monteiro Grillo
SUMMARY: Iris-claw intraocular lens (ICIOL) for aphakia needs a large 5.4 mm corneal incision for its implantation. The technique needs corneal suture, associated with some postoperative astigmatism. Foldable ICIOL is used in phakic patients undergoing refractive surgery and has the advantage of a sutureless small corneal incision. We report a case of a high myopic patient with dislocated intraocular lens (IOL) and no capsular support. Dislocated IOL with its capsular bag was released with three-port, 23-gauge vitrectomy; placed in the anterior chamber; sliced; and extruded through a 3...
2016: International Medical Case Reports Journal
https://www.readbyqxmd.com/read/27843290/vector-analysis-investigation-of-toric-intraocular-lens-with-no-deviation-from-the-intended-axis
#4
Atsushi Kawahara, Yoshinori Takayanagi
AIM: The aim of this research was to evaluate vector analysis after implantation of toric intraocular lenses (IOLs) without deviation from the intended axis. METHODS: The study included 18 eyes of 16 patients who underwent cataract surgery with the insertion of a toric implant (AcrySof IQ Toric). The postoperative IOL meridian placement completely corresponded to that planned. Using vector analysis, surgically induced astigmatism (SIA) was derived from the refractive outcome versus the predicted postoperative keratometric astigmatism and was compared with targeted induced astigmatism (TIA)...
2016: Clinical Ophthalmology
https://www.readbyqxmd.com/read/27843285/clinical-outcomes-with-toric-intraocular-lenses-planned-using-an-optical-low-coherence-reflectometry-ocular-biometer-with-a-new-toric-calculator
#5
Kjell G Gundersen, Richard Potvin
PURPOSE: To prospectively evaluate postoperative clinical outcomes with implantation of toric intraocular lenses (IOLs) using preoperative keratometry from an optical low coherence reflectometry (OLCR) ocular biometer (Lenstar(®) LS900) and the built-in Barrett toric calculator. PATIENTS AND METHODS: A prospective observational study recruited one or both eyes of subjects who underwent uncomplicated cataract surgery with toric IOL implantation using OLCR biometery data and the Barrett toric IOL calculator for toric IOL planning...
2016: Clinical Ophthalmology
https://www.readbyqxmd.com/read/27834962/agreement-and-clinical-comparison-between-a-new-swept-source-optical-coherence-tomography-based-optical-biometer-and-an-optical-low-coherence-reflectometry-biometer
#6
P Arriola-Villalobos, J Almendral-Gómez, N Garzón, J Ruiz-Medrano, C Fernández-Pérez, J M Martínez-de-la-Casa, D Díaz-Valle
PurposeTo compare measurements taken using a swept-source optical coherence tomography-based optical biometer (IOLmaster 700) and an optical low-coherence reflectometry biometer (Lenstar 900), and to determine the clinical impacts of differences in their measurements on intraocular lens (IOL) power predictions.MethodsEighty eyes of 80 patients scheduled to undergo cataract surgery were examined with both biometers. The measurements made using each device were axial length (AL), central corneal thickness (CCT), aqueous depth (AQD), lens thickness (LT), mean keratometry (MK), white-to-white distance (WTW), and pupil diameter (PD)...
November 11, 2016: Eye
https://www.readbyqxmd.com/read/27833928/comparison-of-a-new-optical-biometer-and-a-standard-biometer-in-cataract-patients
#7
Pipat Kongsap
BACKGROUND: Cataract surgery is the most common surgical procedure in ophthalmology. Biometry data and accurate intraocular lens (IOL) calculations are very important in achieving the desired refractive outcomes. The aim of this study was to compare measurements using a new optical low coherence reflectometry (OLCR) biometer (OA-2000) and the gold standard partial coherence interferometry (PCI) optical biometer (IOLMaster 500). METHODS: Ocular biometry of cataract patients were measured by the OA-2000 and IOLMaster 500 to compare keratometry (K), axial length (AL), anterior chamber depth (ACD), white-to-white (WTW) diameter, and IOL power using the SRK/T formula...
2016: Eye and Vision (London, England)
https://www.readbyqxmd.com/read/27793471/effect-of-pharmacological-pupil-dilation-on-measurements-and-iol-power-calculation-made-using-the-new-swept-source-optical-coherence-tomography-based-optical-biometer
#8
P Arriola-Villalobos, J Almendral-Gómez, N Garzón, J Ruiz-Medrano, C Fernández-Pérez, J M Martínez-de-la-Casa, D Díaz-Valle
PURPOSE: To determine whether pupil dilation affects biometric measurements and intraocular lens (IOL) power calculation made using the new swept-source optical coherence tomography-based optical biometer (IOLMaster 700(©); Carl Zeiss Meditec, Jena, Germany). PROCEDURES: Eighty-one eyes of 81 patients evaluated for cataract surgery were prospectively examined using the IOLMaster 700(©) before and after pupil dilation with tropicamide 1%. The measurements made were: axial length (AL), central corneal thickness (CCT), aqueous chamber depth (ACD), lens thickness (LT), mean keratometry (MK), white-to-white distance (WTW) and pupil diameter (PD)...
October 25, 2016: Journal Français D'ophtalmologie
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
#9
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/27769585/prediction-of-postoperative-intraocular-lens-position-with-angle-to-angle-depth-using-anterior-segment-optical-coherence-tomography
#10
So Goto, Naoyuki Maeda, Shizuka Koh, Kazuhiko Ohnuma, Kenichi Hayashi, Ikko Iehisa, Toru Noda, Kohji Nishida
PURPOSE: To evaluate the accuracy of a new formula for predicting postoperative anterior chamber depth (ACD) with preoperative angle-to-angle (ATA) depth using anterior segment (AS) optical coherence tomography (OCT) and to compare it with established methods. DESIGN: Retrospective consecutive case series. PARTICIPANTS: Three hundred four eyes (276 patients) implanted with acrylic intraocular lenses (IOLs) were divided randomly into a training set (152 eyes) and a validation set (152 eyes)...
October 18, 2016: Ophthalmology
https://www.readbyqxmd.com/read/27748658/intraocular-lens-calculations-after-laser-vision-correction
#11
Claudia E Perez-Straziota, J Bradley Randleman
PURPOSE OF REVIEW: This article describes different strategies for corneal measurements and/or intraocular lens (IOL) calculations and proposes a systematic approach for IOL selection in patients who have undergone laser corneal refractive surgery. RECENT FINDINGS: Corneal measurements and IOL calculations cannot be obtained accurately with the standard measuring technologies and formulas in patients with history of laser corneal refractive surgery; therefore a variety of methods and formulas, some of which required prerefractive surgery data, have been proposed to improve the accuracy of measurements and calculations...
January 2017: Current Opinion in Ophthalmology
https://www.readbyqxmd.com/read/27703323/toric-intraocular-lens-orientation-and-residual-refractive-astigmatism-an-analysis
#12
Rick Potvin, Brent A Kramer, David R Hardten, John P Berdahl
PURPOSE: To analyze intraocular lens (IOL) orientation data from an online toric back-calculator (astigmatismfix.com) for determining if differences were apparent by lens type. METHODS: A retrospective review of astigmatismfix.com toric back-calculations that included IOL identification and intended orientation axis. RESULTS: Of 12,812 total validated calculation records, 8,229 included intended orientation and lens identification data. Of the latter, 5,674 calculations (69%) involved lenses oriented 5° or more from their intended position...
2016: Clinical Ophthalmology
https://www.readbyqxmd.com/read/27702623/changes-in-ocular-parameters-and-intraocular-lens-powers-in-aging-cycloplegic-eyes
#13
Pelin Özyol, Erhan Özyol, Ercan Baldemir
PURPOSE: Age-related changes in lens elasticity and ciliary muscle contractility can affect how ocular parameters respond to cycloplegia, and therefore intraocular lens (IOL) power measurements calculated by formulas using anterior chamber depth (ACD), lens thickness (LT), or white-to-white (WtW) for effective lens position prediction can vary. In response, using swept-source optical biometry in prepresbyopic and presbyopic eyes, we investigated changes in ocular parameters and IOL power calculations attributable to cycloplegia...
January 2017: American Journal of Ophthalmology
https://www.readbyqxmd.com/read/27697245/differences-in-visual-quality-with-orientation-of-a-rotationally-asymmetric-bifocal-intraocular-lens-design
#14
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/27672591/effects-of-posterior-corneal-astigmatism-on-the-accuracy-of-acrysof-toric-intraocular-lens-astigmatism-correction
#15
Bin Zhang, Jing-Xue Ma, Dan-Yan Liu, Cong-Rong Guo, Ying-Hua Du, Xiu-Jin Guo, Yue-Xian Cui
AIM: To evaluate the effects of posterior corneal surface measurements on the accuracy of total estimated corneal astigmatism. METHODS: Fifty-seven patients with toric intraocular lens (IOL) implantation and posterior corneal astigmatism exceeding 0.5 diopter were enrolled in this retrospective study. The keratometric astigmatism (KA) and total corneal astigmatism (TA) were measured using a Pentacam rotating Scheimpflug camera to assess the outcomes of AcrySof IOL implantation...
2016: International Journal of Ophthalmology
https://www.readbyqxmd.com/read/27642519/outcomes-of-sutureless-iris-claw-lens-implantation
#16
Tomasz Choragiewicz, Robert Rejdak, Andrzej Grzybowski, Katarzyna Nowomiejska, Joanna Moneta-Wielgoś, Małgorzata Ozimek, Anselm G M Jünemann
Purpose. To evaluate the indications, refraction, and visual and safety outcomes of iris-claw intraocular lens implanted retropupillary with sutureless technique during primary or secondary operation. Methods. Retrospective study of case series. The Haigis formula was used to calculate intraocular lens power. In all cases the wound was closed without suturing. Results. The study comprised 47 eyes. The mean follow-up time was 15.9 months (SD 12.2). The mean preoperative CDVA was 0.25 (SD 0.21). The final mean CDVA was 0...
2016: Journal of Ophthalmology
https://www.readbyqxmd.com/read/27623723/associations-between-ocular-biometry-and-anthropometric-measurements-in-a-nigerian-population
#17
Sarat Abolore Badmus, Ayotunde Idowu Ajaiyeoba, Bernice Oluwakemi Adegbehingbe, Oluwatoyin Helen Onakpoya, Adenike Odunmorayo Adeoye
PURPOSE: The study aimed at determining the associations between ocular biometry and anthropometric measurements in a Nigerian adult population. SUBJECTS AND METHODS: Participants were healthy members of staff and students of Obafemi Awolowo University Teaching Hospitals Complex, Ile-Ife. The height and weight were measured, and the body mass index (BMI) was calculated. Ocular axial length (AL), anterior chamber depth (ACD), keratometric readings (K) and corneal radius of curvature were measured with the IOL Master...
July 2016: Nigerian Postgraduate Medical Journal
https://www.readbyqxmd.com/read/27595014/prognostic-factors-for-visual-outcome-in-traumatic-cataract-patients
#18
Ying Qi, Yan F Zhang, Yu Zhu, Ming G Wan, Shan S Du, Zhen Z Yue
Purpose. To investigate the prognostic factors for visual outcome in traumatic cataract patients. Methods. The demographic features of traumatic cataract patients in Central China were studied. The factors that might influence the visual outcome were analyzed. The sensitivity and specificity of OTS (ocular trauma score) in predicting VA were calculated. Results. The study enrolled 480 cases. 65.5% of patients achieved VA at >20/60. The factors associated with the final VA were initial VA, injury type, wound location, the way of cataract removal, and IOL implantation...
2016: Journal of Ophthalmology
https://www.readbyqxmd.com/read/27586670/scheimpflug-camera-combined-with-placido-disk-corneal-topography-and-optical-biometry-for-intraocular-lens-power-calculation
#19
Ahmet Kirgiz, Kurşat Atalay, Havva Kaldirim, Kubra Serefoglu Cabuk, Mehmet Orcun Akdemir, Muhittin Taskapili
The purpose of this study was to compare the keratometry (K) values obtained by the Scheimpflug camera combined with placido-disk corneal topography (Sirius) and optical biometry (Lenstar) for intraocular lens (IOL) power calculation before the cataract surgery, and to evaluate the accuracy of postoperative refraction. 50 eyes of 40 patients were scheduled to have phacoemulsification with the implantation of a posterior chamber intraocular lens. The IOL power was calculated using the SRK/T formula with Lenstar K and K readings from Sirius...
September 1, 2016: International Ophthalmology
https://www.readbyqxmd.com/read/27569700/intraocular-lens-dislocation-in-pseudoexfoliation-a-systematic-review-and-meta-analysis
#20
Pedro Vazquez-Ferreiro, Francisco J Carrera-Hueso, Narjis Fikri-Benbrahim, Lidia Barreiro-Rodriguez, Marta Diaz-Rey, María Auxiliadora Ramón Barrios
PURPOSE: To evaluate the impact of pseudoexfoliation syndrome on intraocular lens (IOL) dislocation after phacoemulsification cataract surgery and explore possible associations related to surgical technique. METHODS: We systematically searched the MEDLINE, Embase, Web of Science, Cochrane, and Lilacs databases and grey literature sources and identified (on March 1, 2016) 14 cohort and case-control studies comparing IOL dislocation in patients with and without pseudoexfoliation syndrome who had undergone phacoemulsification...
August 29, 2016: Acta Ophthalmologica
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