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https://www.readbyqxmd.com/read/28317681/comparison-of-biometry-and-intraocular-lens-power-calculation-performed-by-a-new-optical-biometry-device-and-a-reference-biometer
#1
Bruna V Ventura, Marcelo C Ventura, Li Wang, Douglas D Koch, Mitchell P Weikert
PURPOSE: To compare biometry measurements and intraocular lens (IOL) power calculations obtained by a new optical A-scan interferometer biometer (Galilei G6) (new biometer) and a partial coherence interferometer biometer (IOLMaster 500) (reference biometer). SETTING: Private practice, Recife, Brazil. DESIGN: Retrospective comparative study. METHODS: Cataract patients who had biometric measurements with the new biometer and the reference biometer were included in the study...
January 2017: Journal of Cataract and Refractive Surgery
https://www.readbyqxmd.com/read/28273986/a-comparative-study-to-assess-the-predictability-of-different-iol-power-calculation-formulas-in-eyes-of-short-and-long-axial-length
#2
Dharmil Doshi, Purvi Limdi, Nilesh Parekh, Neepa Gohil
INTRODUCTION: Accurate Intraocular Lens (IOL) power calculation in cataract surgery is very important for providing postoperative precise vision. Selection of most appropriate formula is difficult in high myopic and hypermetropic patients. AIM: To investigate the predictability of different IOL (Intra Ocular Lens) power calculation formulae in eyes with short and long Axial Length (AL) and to find out most accurate IOL power calculation formula in both groups. MATERIALS AND METHODS: A prospective study was conducted on 80 consecutive patients who underwent phacoemulsification with monofocal IOL implantation after obtaining an informed and written consent...
January 2017: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/28264129/the-effect-of-lens-sphere-and-cylinder-power-on-residual-astigmatism-and-its-resolution-after-toric-intraocular-lens-implantation
#3
John P Berdahl, David R Hardten, Brent A Kramer, Richard Potvin
PURPOSE: To analyze correlations between residual refractive cylinder (and its correction through lens reorientation) with the sphere and cylinder power of the toric intraocular lens (IOL) implanted. METHODS: An online toric back-calculator (www.astigmatismfix.com) allows users to input toric IOL planning data, along with postoperative IOL orientation and refractive results; these data are used to determine the optimal orientation of the IOL to reduce refractive astigmatism...
March 1, 2017: Journal of Refractive Surgery
https://www.readbyqxmd.com/read/28237150/spectacle-plane-add-power-of-multifocal-intraocular-lenses-according-to-effective-lens-position
#4
Youngsub Eom, Jong Suk Song, Hyo Myung Kim
OBJECTIVE: To evaluate the accuracy of predicting the spectacle plane add power of multifocal intraocular lenses (MIOLs) based on the effective lens position (ELP) using the Haigis formula. DESIGN: Retrospective cross-sectional study. PARTICIPANTS: A total of 26 eyes from 18 consecutive patients who underwent phacoemulsification with Tecnis MIOL (Z*B00) implantation. METHODS: The postoperative spectacle plane add power of MIOLs was determined from the monocular defocus curve...
February 2017: Canadian Journal of Ophthalmology. Journal Canadien D'ophtalmologie
https://www.readbyqxmd.com/read/28231267/accuracy-of-optical-biometry-combined-with-placido-disc-corneal-topography-for-intraocular-lens-power-calculation
#5
Giacomo Savini, Kenneth J Hoffer, Piero Barboni, Nicole Balducci, Domenico Schiano-Lomoriello, Pietro Ducoli
PURPOSE: To investigate the accuracy of a new optical biometer for intraocular lens (IOL) power calculation in eyes undergoing cataract surgery. METHODS: Consecutive eyes of patients undergoing cataract surgery with the same IOL model were enrolled in a prospective cohort study. Axial length (AL) and corneal power were measured with an optical biometer based on optical low-coherence interferometry and Placido-disc corneal topography. IOL power was calculated with the Hoffer Q, Holladay 1 and SRK/T formulas...
2017: PloS One
https://www.readbyqxmd.com/read/28228410/prediction-of-the-true-iol-position
#6
Sverker Norrby, Rolf Bergman, Nino Hirnschall, Yutaro Nishi, Oliver Findl
PURPOSE: To develop algorithms for preoperative estimation of the true postoperative intraocular lens (IOL) position to be used for IOL power calculation. SETTING: Moorfields Eye Hospital NHS Foundation Trust, London, UK. METHODS: Fifty patients were implanted randomly with a 3-piece IOL model in one eye and a 1-piece model in the other eye. Preoperatively, the IOLMaster was used to determine axial length, anterior chamber depth and mean corneal radius...
February 22, 2017: British Journal of Ophthalmology
https://www.readbyqxmd.com/read/28192584/laser-assisted-capsulotomy-centration-a-prospective-trial-comparing-pupil-versus-oct-based-scanned-capsule-centration
#7
Tim Schultz, Nikolaos Tsiampalis, H Burkhard Dick
PURPOSE: To investigate different capsulotomy centration methods for femtosecond laser-assisted cataract surgery. The overlap between intraocular lens (IOL) optic and lens capsule was measured with different centration methods and IOL types. METHODS: This was a prospective randomized clinical trial. Patients with cataract scheduled for femtosecond laser-assisted cataract surgery were assigned to one of four treatment groups: optical coherence tomography (OCT)-based scanned capsule centration (SCC) and three-piece IOL (SCC with three-piece IOL); scanned capsule centration and plate-haptic IOL (SCC with plate-haptic IOL); pupil centration (PC) and three-piece IOL (PC with three-piece IOL); or PC and plate-haptic IOL (PC with plate-haptic IOL)...
February 1, 2017: Journal of Refractive Surgery
https://www.readbyqxmd.com/read/28185842/corneal-astigmatism-measurement-by-ray-tracing-versus-anterior-surface-based-keratometry-in-candidates-for-toric-iol-implantation
#8
Ugo de Sanctis, Piero Donna, Rachele R Penna, Maria Isabella Calastri, Chiara M Eandi
PURPOSE: To compare corneal astigmatism derived from total corneal refractive power (CATCRP), a ray-tracing method, with that derived from simulated keratometry (CASimK), an anterior surface-based method, in candidates for toric intraocular lens (IOL) implantation. DESIGN: Reliability analysis. METHODS: In one eye of 200 consecutive patients (mean age 71 ±9 years) with cataract, a Pentacam HR (Oculus, Wetzlar, Germany) was used to measure CATCRP and CASimK...
February 6, 2017: American Journal of Ophthalmology
https://www.readbyqxmd.com/read/28161922/a-prospective-evaluation-of-posterior-capsule-opacification-in-eyes-with-posterior-capsule-plaque-a-case-control-study
#9
Abhay R Vasavada, Mamidipudi R Praveen, Gauri D Shah, Kaid Johar, Rajkumar Sankaranarayanan
PURPOSE: To compare the development of posterior capsule opacification (PCO) between eyes with and without posterior capsule plaque after single-piece hydrophobic acrylic intraocular lens (IOL) implantation 5 years postoperatively. DESIGN: A prospective observational case-control study. METHODS: One hundred one consecutive eyes with posterior capsule plaque (cases) were compared with the same number of cataractous eyes without posterior capsule plaque (controls)...
January 2017: Asia-Pacific Journal of Ophthalmology
https://www.readbyqxmd.com/read/28130351/repeatability-and-agreement-of-ocular-biometry-measurements-aladdin-versus-lenstar
#10
Colm McAlinden, Rongrong Gao, Ayong Yu, Xiaorui Wang, Jing Yang, Ye Yu, Hao Chen, Qinmei Wang, Jinhai Huang
OBJECTIVE: To assess the repeatability and agreement between the Aladdin and Lenstar biometers. METHODS: Three consecutive measurements of the right eye of 102 subjects were acquired by the Aladdin (V.1.1.3) and the Lenstar (V.1.0.3), respectively, with a random order of which biometer to use first. Parameters compared included axial length (AL), anterior chamber depth (ACD), flat keratometry (Kf), steep keratometry (Ks), mean keratometry (Km), J0, J45 and white-to-white (WTW) distance...
January 27, 2017: British Journal of Ophthalmology
https://www.readbyqxmd.com/read/28114313/the-relationship-between-crystalline-lens-power-and-refractive-error-in-older-chinese-adults-the-shanghai-eye-study
#11
Jiangnan He, Lina Lu, Xiangui He, Xian Xu, Xuan Du, Bo Zhang, Huijuan Zhao, Jida Sha, Jianfeng Zhu, Haidong Zou, Xun Xu
PURPOSE: To report calculated crystalline lens power and describe the distribution of ocular biometry and its association with refractive error in older Chinese adults. METHODS: Random clustering sampling was used to identify adults aged 50 years and above in Xuhui and Baoshan districts of Shanghai. Refraction was determined by subjective refraction that achieved the best corrected vision based on monocular measurement. Ocular biometry was measured by IOL Master...
2017: PloS One
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
#12
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
#13
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
#14
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...
February 2017: 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
#15
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
#16
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...
March 2017: Cornea
https://www.readbyqxmd.com/read/27968870/developmental-profile-of-ocular-refraction-in-patients-with-congenital-cataract-a-prospective-cohort-study
#17
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
#18
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
#19
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
#20
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
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