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https://www.readbyqxmd.com/read/28917408/refractive-outcome-comparison-between-vitreomacular-interface-disorders-after-phacovitrectomy
#1
Zeynep Eylül Ercan, İmren Akkoyun, Eylem Yaman Pınarcı, Gürsel Yılmaz, Hülya Topçu
PURPOSE: To compare the refractive accuracy of intraocular lens (IOL) power calculations between patients with vitreomacular interface disorders who had phacovitrectomy for vitreomacular traction (VMT), epiretinal membranes (ERM), and macular holes. SETTING: Baskent University Department of Ophthalmology, Ankara, Turkey. DESIGN: Retrospective case series. METHODS: Refraction results 8 weeks postoperatively were compared between phacovitrectomy (3 study groups comprising eyes with VMT with intrafoveal pseudocysts, ERM, or medium-to-large macular holes) and phacoemulsification (control group comprising eyes having phacoemulsification only)...
August 2017: Journal of Cataract and Refractive Surgery
https://www.readbyqxmd.com/read/28913996/intraocular-lens-power-calculation-after-refractive-surgery-a-comparative-analysis-of-accuracy-and-predictability
#2
Byeong Soo Kang, Jeong Mo Han, Joo Youn Oh, Mee Kum Kim, Won Ryang Wee
PURPOSE: To compare the accuracy of intraocular lens (IOL) power calculation using conventional regression formulae or the American Society of Cataract and Refractive Surgery (ASCRS) IOL power calculator for previous corneal refractive surgery. METHODS: We retrospectively reviewed 96 eyes from 68 patients that had undergone cataract surgery after keratorefractive surgeries. We calculated the formula with two approaches: IOL powers using the ASCRS IOL power calculator and IOL powers using conventional formulae with previous refractive data (Camellin, Jarade, Savini, and clinical history method) or without prior data (0, 2 and, 4 mm total mean power in topography, Wang-Koch-Maloney, Shammas, Seitz, and Maloney)...
June 29, 2017: Korean Journal of Ophthalmology: KJO
https://www.readbyqxmd.com/read/28913511/accuracy-of-formulae-for-secondary-intraocular-lens-power-calculations-in-pediatric-aphakia
#3
Fouad R Nakhli, Khaled Emarah, Laila Jeddawi
PURPOSE: To compare the accuracy of axial length vergence formulas versus refractive vergence formulas for secondary intraocular lens (IOL) implantation in pediatric aphakia. METHODS: This retrospective comparative study, evaluated 31 eyes of 31 patients aged ≤3.5 years, who had undergone secondary IOL implantation. The median absolute error (MedAE) was compared between axial length vergence formulas (Hoffer Q, Holladay I, SRK II, and SRK/T) and refractive vergence formulas (Lanchulev, Holladay R, Mackool, and Khan) as well as between formulas within the same vergence...
September 2017: Journal of Current Ophthalmology
https://www.readbyqxmd.com/read/28905823/refractive-outcomes-of-intraoperative-wavefront-aberrometry-versus-optical-biometry-alone-for-intraocular-lens-power-calculation
#4
Zina Zhang, Logan William Thomas, Szu-Yen Leu, Steven Carter, Sumit Garg
PURPOSE: To compare the outcomes of intraoperative wavefront aberrometry versus optical biometry alone for intraocular lens (IOL) power calculation in eyes undergoing cataract surgery with monofocal IOL implantation. METHODS: Preoperative data were obtained with the IOLMaster. Intraoperative aphakic measurements and IOL power calculations were obtained in some patients with the optiwave refractive analysis (ORA) system. Analysis was performed to determine the accuracy of monofocal IOL power prediction and postoperative manifest refraction at 1 month of the ORA versus IOLMaster...
September 2017: Indian Journal of Ophthalmology
https://www.readbyqxmd.com/read/28887901/meta-analysis-of-accuracy-of-intraocular-lens-power-calculation-formulas-in-short-eyes
#5
Qiwei Wang, Wu Jiang, Tiao Lin, Xiaohang Wu, Haotian Lin, Weirong Chen
IMPORTANCE: Intraocular lens (IOL) power selection is a critical factor affecting visual outcome after IOL implantation in short eyes. Many formulas have been developed to achieve a precise prediction of the IOL power. However, controversy regarding the accuracy remains. BACKGROUND: To investigate the accuracy of different IOL power calculation formulas in short eyes. DESIGN: Meta-analysis PARTICIPANTS: Patients with the axial length of eyes less than 22mm from previously reported studies...
September 9, 2017: Clinical & Experimental Ophthalmology
https://www.readbyqxmd.com/read/28882754/mini-review-far-peripheral-vision
#6
Michael J Simpson
The region of far peripheral vision, beyond 60 degrees of visual angle, is important to the evaluation of peripheral dark shadows (negative dysphotopsia) seen by some intraocular lens (IOL) patients. Theoretical calculations show that the limited diameter of an IOL affects ray paths at large angles, leading to a dimming of the main image for small pupils, and to peripheral illumination by light bypassing the IOL for larger pupils. These effects are rarely bothersome, and cataract surgery is highly successful, but there is a need to improve the characterization of far peripheral vision, for both pseudophakic and phakic eyes...
September 9, 2017: Vision Research
https://www.readbyqxmd.com/read/28836956/comparison-of-astigmatism-prediction-error-taken-with-the-pentacam-measurements-baylor-nomogram-and-barrett-formula-for-toric-intraocular-lens-implantation
#7
Dae-Young Park, Dong Hui Lim, Sungsoon Hwang, Joo Hyun, Tae-Young Chung
BACKGROUND: To evaluate and compare the astigmatism prediction errors taken with the Pentacam measurements, Baylor nomogram, and Barrett formula for toric intraocular lens (IOL) implantation. METHODS: Phacoemulsification with toric Precizon IOL implantation was performed in 41 eyes with corneal astigmatism (range, 1 to 5 diopters (D)) determined by IOLMaster and SimK on Pentacam. Preoperative corneal astigmatism measurements were obtained from IOLMaster readings (IOLMaster, Baylor-IOLMaster, and Barrett-IOLMaster) and Pentacam readings (SimK, Baylor-SimK, Barrett-SimK, wavefront, true net power, total corneal refractive power, and vector derived by manual vector summation using corneal front and back astigmatism)...
August 24, 2017: BMC Ophthalmology
https://www.readbyqxmd.com/read/28835226/intraocular-lens-power-calculation-using-standard-formulas-and-ray-tracing-after-dmek-in-patients-with-fuchs-endothelial-dystrophy
#8
Maged Alnawaiseh, Lars Zumhagen, André Rosentreter, Nicole Eter
BACKGROUND: The study presented here aims to optimize the accuracy of intraocular lens (IOL) power calculations in patients after DMEK by evaluation of the impact of the altered anterior/posterior corneal curvature relationship. METHODS: Scheimpflug-based Oculus Pentacam imaging was performed after DMEK surgery for Fuchs endothelial dystrophy. The IOL power was calculated for all patients by ray tracing, aiming for postoperative emmetropia. We also performed the IOL calculation using four third-generation formulas (SRK-T, Hoffer-Q, Holladay-1 and Haigis)...
August 23, 2017: BMC Ophthalmology
https://www.readbyqxmd.com/read/28808644/the-comparative-study-of-refractive-index-variations-between-haigis-srk-t-and-hoffer-q-formulas-used-for-preoperative-biometry-calculation-in-patients-with-the-axial-length-25-mm
#9
Hasan Razmjoo, Hosein Atarzadeh, Neda Kargar, Mohammad Behfarnia, Kobra Nasrollahi, Ali Kamali
BACKGROUND: To compare refractive index variation between Hoffer-Q, Haigis and SRK/T formulas used for preoperative biometry calculation in patients with axial length >25 mm, undergoing cataract surgery. MATERIALS AND METHODS: This is a randomized clinical trial study was performed on 54 eyes of 54 patients with ages of 40-70 years old and axial length >25 mm classified into three groups that their IOL POWER were calculated by Haigis, SRK/T and Hoffer-Q formulas before undergoing cataract surgery...
2017: Advanced Biomedical Research
https://www.readbyqxmd.com/read/28803418/clinical-results-after-microincision-biaxial-cataract-surgery-and-implantation-of-an-incise-intraocular-lens
#10
Wojciech Lubiński, Marta Kirkiewicz, Karolina Podborączyńska-Jodko
PURPOSE: To evaluate clinical outcomes after uncomplicated microincision biaxial cataract surgery and implantation of Incise intraocular lens (IOL). METHODS: This study included 47 eyes of 29 patients (mean age 62.2 ± 8.6 years), who underwent 1.4-mm biaxial cataract surgery with implantation of the Incise IOL (Bausch and Lomb). At third month, surgically induced astigmatism (SIA) was calculated. Three, 6 and 12 months postoperatively, uncorrected distance visual acuity (UDVA), corrected distance visual acuity (CDVA), corrected near visual acuity (CNVA) LogMAR ETDRS, spherical equivalent refraction (SER), photopic distance corrected contrast sensitivity (CS) with and without glare (85 cd/m(2)) (CSV-1000) were assessed...
August 12, 2017: International Ophthalmology
https://www.readbyqxmd.com/read/28780778/iol-power-calculation-in-short-and-long-eyes
#11
Kenneth J Hoffer, Giacomo Savini
An analysis of the studies published in the past 50 years reveals that the Haigis, Hoffer Q, and Holladay 2 formulas are the best options for intraocular lens power prediction in short eyes (<22 mm). In long eyes (>26 mm), the Barrett Universal II, Haigis (with optimized constants), Olsen, and SRK/T formulas provide the most accurate outcomes for intraocular lens power prediction.
July 2017: Asia-Pacific Journal of Ophthalmology
https://www.readbyqxmd.com/read/28778114/comparison-of-hill-radial-basis-function-barrett-universal-and-current-third-generation-formulas-for-the-calculation-of-intraocular-lens-power-during-cataract-surgery
#12
Timothy V Roberts, Chris Hodge, Gerard Sutton, Michael Lawless
IMPORTANCE: This study represents a novel comparison of recently introduced intraocular lens power calculation formulas. BACKGROUND: To compare current new generation formulas for calculating the intraocular lens power for a standard cohort of patients undergoing cataract and lens replacement surgery in a private group practice in Australia. DESIGN: Retrospective case series comparison. PARTICIPANTS: Postoperative results from 400 consecutive patients undergoing implantation of an SN60WF intraocular lens post cataract removal by 12 surgeons were used...
August 4, 2017: Clinical & Experimental Ophthalmology
https://www.readbyqxmd.com/read/28757694/evaluation-of-a-new-electronic-preoperative-reference-marker-for-toric-intraocular-lens-implantation-by-two-different-methods-of-analysis-adobe-photoshop-versus-itrace
#13
Javed Hussain Farooqui, Mansi Sharma, Archana Koul, Ranjan Dutta, Noshir Minoo Shroff
PURPOSE: The aim of this study is to compare two different methods of analysis of preoperative reference marking for toric intraocular lens (IOL) after marking with an electronic marker. SETTING/VENUE: Cataract and IOL Implantation Service, Shroff Eye Centre, New Delhi, India. PATIENTS AND METHODS: Fifty-two eyes of thirty patients planned for toric IOL implantation were included in the study. All patients had preoperative marking performed with an electronic preoperative two-step toric IOL reference marker (ASICO AE-2929)...
May 2017: Oman Journal of Ophthalmology
https://www.readbyqxmd.com/read/28750611/clinical-efficacy-of-implantation-of-toric-intraocular-lenses-with-different-incision-positions-a-comparative-study-of-steep-axis-incision-and-non-steep-axis-incision
#14
Wenwen He, Xiangjia Zhu, Yu Du, Jin Yang, Yi Lu
BACKGROUND: To compare the clinical outcomes after implantation of AcrySof Toric IOLs with different clear corneal incisions. METHODS: Sixty cataract patients with regular corneal astigmatism who underwent phacoemulsification combined with implantation of an AcrySof Toric IOL were enrolled. They were divided into two groups according to the position of the clear corneal incision: steep-axis and non-steep-axis. Main outcome measurements included visual acuity, residual astigmatism and changes of corneal astigmatism 3 months postoperatively...
July 27, 2017: BMC Ophthalmology
https://www.readbyqxmd.com/read/28749896/elimination-of-anterior-corneal-steepening-with-descemet-membrane-endothelial-keratoplasty-in-a-patient-with-fuchs-dystrophy-and-keratoconus-implications-for-iol-calculation
#15
Reena Gupta, Ruta Kinderyte, Deborah S Jacobs, Ula V Jurkunas
PURPOSE: To report a case of coexistent Fuchs endothelial corneal dystrophy (FECD) and keratoconus (KCN) in which there was normalization of corneal topography after Descemet membrane endothelial keratoplasty (DMEK). METHODS: Retrospective medical record review. RESULTS: Preoperative findings revealed a best-corrected visual acuity of 20/40 with -1.00 - 2.50 × 147, topographic maximum keratometry of 50.8 D with inferior steeping, and confluent guttae in the left eye...
October 2017: Cornea
https://www.readbyqxmd.com/read/28737918/reactive-inelastic-and-dissociation-processes-in-collisions-of-atomic-oxygen-with-molecular-nitrogen
#16
F Esposito, I Armenise
We report the results of detailed calculations of reactive, inelastic, and dissociative processes in collisions of atomic oxygen with molecular nitrogen in their respective electronic ground states. Cross sections are calculated as a function of collision energy in the range 0.001-10 eV, considering the whole rovibrational ladder. Some problems related to the vibrational energy levels of the asymptotes of (3)A″ and (3)A' potential energy surfaces used in this work are solved by an appropriate scaling at the level of cross sections...
August 11, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28732608/population-based-analysis-of-intraocular-lens-exchange-and-repositioning
#17
Andrei-Alexandru Szigiato, Matthew B Schlenker, Iqbal Ike K Ahmed
PURPOSE: To determine the incidence and trends in intraocular lens (IOL) repositioning, exchange, and explantation. SETTING: Department of Ophthalmology and Vision Sciences, University of Toronto, Toronto, Ontario, Canada. DESIGN: Population-based retrospective data analysis. METHODS: Service claims from 2000 to 2013 were analyzed for the total yearly number of IOL repositionings, exchanges, and explantations in Ontario, Canada, including the number of surgeons performing them by subspecialty...
June 2017: Journal of Cataract and Refractive Surgery
https://www.readbyqxmd.com/read/28732607/refractive-outcomes-and-complications-after-combined-copolymer-phakic-intraocular-lens-explantation-and-phacoemulsification-with-intraocular-lens-implantation
#18
Paolo G Meier, François Majo, Philippe Othenin-Girard, Ciara Bergin, Ivo Guber
PURPOSE: To assess safety, efficacy, and predictability of combined Implantable Collamer Lens phakic intraocular lens (pIOL) explantation and phacoemulsification and to report the rate of complications. A secondary aim was to examine whether intraocular lens (IOL) power calculation was affected by the pIOL in situ. SETTING: Jules-Gonin Eye Hospital, Lausanne, Switzerland. DESIGN: Retrospective case series. METHODS: The records of patients having pIOL implantation with subsequent phacoemulsification were reviewed...
June 2017: Journal of Cataract and Refractive Surgery
https://www.readbyqxmd.com/read/28732605/prediction-of-postoperative-intraocular-lens-tilt-using-swept-source-optical-coherence-tomography
#19
Nino Hirnschall, Tobias Buehren, Ferid Bajramovic, Michael Trost, Tanja Teuber, Oliver Findl
PURPOSE: To compare crystalline lens tilt in eyes before and intraocular lens (IOL) tilt in eyes after cataract surgery using swept-source optical coherence tomography (SS-OCT) (IOLMaster 700). SETTING: Hanusch Hospital, Vienna, Austria. DESIGN: Prospective case series. METHODS: Patients' eyes were scanned 1 week before and 2 months after cataract surgery with IOL implantation using an SS-OCT device. This device performs B-scans along 6 meridians (0, 30, 60, 90, 120, and 150 degrees) to determine lens and IOL tilt...
June 2017: Journal of Cataract and Refractive Surgery
https://www.readbyqxmd.com/read/28732602/pursuing-perfection-in-intraocular-lens-calculations-i-logical-approach-for-classifying-iol-calculation-formulas
#20
EDITORIAL
Douglas D Koch, Warren Hill, Adi Abulafia, Li Wang
No abstract text is available yet for this article.
June 2017: Journal of Cataract and Refractive Surgery
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