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https://www.readbyqxmd.com/read/28050320/changes-in-anterior-chamber-depth-after-phacoemulsification-in-pseudoexfoliative-eyes-and-their-effect-on-accuracy-of-intraocular-lens-power-calculation
#1
Sirel Gür Güngör, Ahmet Akman, Leyla Asena, Mustafa Aksoy, Almila Sarıgül Sezenöz
OBJECTIVES: To compare anterior chamber depth (ACD) changes after phacoemulsification surgery in patients with pseudoexfoliation syndrome (PEX) and normal patients using an anterior segment imaging method. Another aim of this study was to evaluate the effect of these changes on the accuracy of intraocular lens (IOL) power calculation and postoperative refraction. MATERIALS AND METHODS: Twenty-two eyes of 22 patients with PEX and 30 eyes of 30 normal patients who underwent uneventful phacoemulsification surgery and IOL implantation were included in the study...
December 2016: Turkish Journal of Ophthalmology
https://www.readbyqxmd.com/read/28040496/analysis-of-cataract-surgery-induced-astigmatism-two-polar-methods-comparison
#2
Veronica García-López, Claudia García-López, Victoria de Juan, Raul Martin
PURPOSE: Surgically induced astigmatism (SIA) caused by the incision after cataract surgery may be calculated to improve IOL toric power calculation and achieve better visual outcome. SIA could be determined as the difference between preoperative and postoperative keratometry expressed in polar values using different equations. The objective of this study is to compare the SIA calculated with two different polar value analysis methods [Method #1: KP (90)/KP (135) developed to be used with incisions placed at 90° and Method #2: AKP/AKP (+45) developed to be used independently of the incision location]...
December 28, 2016: Journal of Optometry
https://www.readbyqxmd.com/read/28013392/the-clinical-depth-of-field-achievable-with-trifocal-and-monofocal-intraocular-lenses-theoretical-considerations-and-proof-of-concept-clinical-results
#3
Ante Barišić, Sudi Patel, Nikica Gabric, Claes G Feinbaum
BACKGROUND: To estimate the depth of field (DOF) achievable with multi-and monofocal intraocular lenses (IOLs) and compare with actual measurements of DOF in cases implanted with a trifocal IOL and biconvex monofocal IOL METHODS: I) Computer simulations were produced to describe the relationship between DOF, pupil size, preoperative ametropia, and retinal blur tolerance limit for a model eye implanted with either multi- or monofocal IOLs. II) Monocular DOF and pupil size were measured under distance viewing conditions between 3 and 6 months postoperative following uneventful cataract surgery...
December 24, 2016: Graefe's Archive for Clinical and Experimental Ophthalmology
https://www.readbyqxmd.com/read/28007108/comparison-of-the-rate-of-refractive-growth-in-aphakic-eyes-versus-pseudophakic-eyes-in-the-infant-aphakia-treatment-study
#4
Scott R Lambert, George Cotsonis, Lindreth DuBois, M Edward Wilson, David A Plager, Edward G Buckley, Scott K McClatchey
PURPOSE: To compare the rate of refractive growth (RRG) between aphakic eyes and pseudophakic eyes in the Infant Aphakia Treatment Study (IATS). SETTING: Twelve clinical sites across the United States. DESIGN: Randomized clinical trial. METHODS: Patients randomized to unilateral cataract extraction with contact lens correction versus intraocular lens (IOL) implantation in the IATS had their rate of refractive growth (RRG3) calculated based on the change in refraction from the 1-month postoperative examination to age 5 years...
December 2016: Journal of Cataract and Refractive Surgery
https://www.readbyqxmd.com/read/28002107/astigmatism-correction-with-toric-intraocular-lenses-in-descemet-membrane-endothelial-keratoplasty-triple-procedures
#5
Hideaki Yokogawa, P James Sanchez, Zachary M Mayko, Michael D Straiko, Mark A Terry
PURPOSE: To report the clinical efficacy of astigmatism correction with toric intraocular lenses (IOLs) in patients undergoing the Descemet membrane endothelial keratoplasty (DMEK) triple procedure and to evaluate the accuracy of the correction. METHODS: Fifteen eyes of 10 patients who received cataract extraction, toric IOL placement, and DMEK surgery for Fuchs corneal dystrophy and cataracts were evaluated. The cylinder power of toric IOLs was determined by an online toric calculator with keratoscopy measurements obtained using Scheimpflug corneal imaging...
December 20, 2016: Cornea
https://www.readbyqxmd.com/read/27968870/developmental-profile-of-ocular-refraction-in-patients-with-congenital-cataract-a-prospective-cohort-study
#6
Zhenzhen Liu, Erping Long, Jingjing Chen, Zhuoling Lin, Duoru Lin, Xiaohang Wu, Qianzhong Cao, Xiaoyan Li, Dongni Wang, Lixia Luo, Bo Qu, Runzhong Liu, Xiaopin Liu, Haotian Lin, Weirong Chen, Yizhi Liu
BACKGROUND: Refractive status is crucial to visual function and can change throughout life. For patients with congenital cataract, the developmental profile of refraction is complicated owing to the potential influence of diverse clinical manifestations and various treatments, and has not yet been fully characterised. METHODS: In this prospective cohort study, we enrolled patients with congenital cataract from the Childhood Cataract Program of the Chinese Ministry of Health (CCPMOH)...
October 2016: Lancet
https://www.readbyqxmd.com/read/27957314/the-relationship-between-anterior-chamber-depth-axial-length-and-intraocular-lens-power-among-candidates-for-cataract-surgery
#7
Mohammad Reza Sedaghat, Ali Azimi, Peyman Arasteh, Naghmeh Tehranian, Shahram Bamdad
INTRODUCTION: Basic anatomical parameters in ophthalmology are variable in different countries according to ethnic groups, genetics and some environmental factors. The aim of this study was to determine the relationship between axial length (AL), anterior chamber depth (ACD) and intraocular lens power (IOL) in a referral center from eastern Iran among patients who had cataract surgery, in comparison to studies from other regions of the world. METHODS: In a cross-sectional retrospective study from 2011 to 2013, the records of 698 cataract patients referring to Khatam Al Anbia general hospital in Mashhad, Iran were evaluated...
October 2016: Electronic Physician
https://www.readbyqxmd.com/read/27956289/pterygium-size-and-effect-on-intraocular-lens-power-calculation
#8
Mustafa Koc, Mehmet Murat Uzel, Emre Aydemir, Fuat Yavrum, Pinar Kosekahya, Pelin Yılmazbaş
PURPOSE: To evaluate the effects of pterygium on biometry measurements and the relationship between these effects and pterygium size. SETTING: Ulucanlar Eye Hospital, Ankara, Turkey. DESIGN: Prospective comparative study. METHODS: Patients who had unilateral primary pterygium excision were included in the study group. Anterior segment photographed images were taken of eyes with pterygia to calculate the pterygium length and area using the ImageJ program...
November 2016: Journal of Cataract and Refractive Surgery
https://www.readbyqxmd.com/read/27956286/residual-astigmatism-after-toric-intraocular-lens-implantation-analysis-of-data-from-an-online-toric-intraocular-lens-back-calculator
#9
Brent A Kramer, John P Berdahl, David R Hardten, Richard Potvin
PURPOSE: To evaluate some possible causes for residual astigmatism after toric intraocular lens (IOL) implantation based on an analysis of data from an online toric IOL back-calculator. DESIGN: Retrospective data review. METHODS: An online toric back-calculator was designed to allow users to input preoperative toric planning information along with postoperative IOL orientation and refractive results. These were then used to determine the optimum orientation of the IOL to reduce refractive astigmatism...
November 2016: Journal of Cataract and Refractive Surgery
https://www.readbyqxmd.com/read/27956285/influence-on-intraocular-lens-power-calculation-of-corneal-radii-measurement-using-an-image-guided-system
#10
Bettina C Thomas, Andreas Mueller, Gerd U Auffarth, Mike P Holzer
PURPOSE: To analyze the influence on intraocular lens (IOL) power calculation of corneal radii measured by the Verion Image-Guided System in comparison with those measured by partial coherence interferometry (PCI) (IOLMaster) and optical low-coherence reflectometry (OLCR) (Lenstar) systems. SETTING: International Vision Correction Research Centre, Department of Ophthalmology, University of Heidelberg, Heidelberg, Germany. DESIGN: Prospective case series...
November 2016: Journal of Cataract and Refractive Surgery
https://www.readbyqxmd.com/read/27905889/influence-of-posterior-corneal-astigmatism-on-postoperative-refractive-astigmatism-in-pseudophakic-eyes-after-cataract-surgery
#11
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
#12
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
#13
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
#14
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
#15
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
#16
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
#17
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
#18
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)...
December 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
#19
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
#20
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)...
December 2016: Ophthalmology
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