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IOL power calculation

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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
#1
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/28780778/iol-power-calculation-in-short-and-long-eyes
#2
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-rbf-barrett-universal-and-current-third-generation-formulas-for-the-calculation-of-intraocular-lens-power-during-cataract-surgery
#3
Timothy V Roberts, Chris Hodge, Gerard Sutton, Michael Lawless
IMPORTANCE: This study represents a novel comparison of recently introduced intraocular lens (IOL) power calculation formulas. BACKGROUND: To compare current new generation formulas for calculating the IOL 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 IOL post cataract removal by 12 surgeons were used...
August 4, 2017: Clinical & Experimental 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
#4
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
#5
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...
July 26, 2017: Cornea
https://www.readbyqxmd.com/read/28732607/refractive-outcomes-and-complications-after-combined-copolymer-phakic-intraocular-lens-explantation-and-phacoemulsification-with-intraocular-lens-implantation
#6
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
#7
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/28711218/significant-axial-elongation-with-minimal-change-in-refraction-in-3-to-6-year-old-chinese-preschoolers-the-shenzhen-kindergarten-eye-study
#8
Xinxing Guo, Min Fu, Xiaohu Ding, Ian G Morgan, Yangfa Zeng, Mingguang He
PURPOSE: To document the distribution of ocular biometry and to evaluate its associations with refraction in a group of Chinese preschoolers. DESIGN: Population-based cross-sectional study. PARTICIPANTS: A total of 1133 preschoolers 3 to 6 years of age from 8 representative kindergartens. METHODS: Biometric measurements including axial length (AL), anterior chamber depth (ACD), and corneal radius of curvature (CR) were obtained from partial-coherence laser interferometry (IOL Master; Carl Zeiss Meditec, Oberkochen, Germany) before cycloplegia...
July 13, 2017: Ophthalmology
https://www.readbyqxmd.com/read/28693457/calculation-of-iris-claw-iol-power-for-correction-of-late-in-the-bag-iol-complex-dislocation
#9
Valentín Huerva, Francisco J Ascaso, Isabel Caral, Andrzej Grzybowski
BACKGROUND: To assess the constants and formula for aphakia correction with iris-claw IOLs to achieve the best refractive status in cases of late in-the-bag IOL complex dislocation. METHODS: A literature search was performed. The following data were obtained: Iris-claw IOL model, Iridal or retroiridal enclavation, A-constant, ultrasound or optical biometry, formula employed and refractive outcomes. Acceptable emmetropia was considered if the resulting spherical equivalent (SE) was within ±1...
July 11, 2017: BMC Ophthalmology
https://www.readbyqxmd.com/read/28681907/corneal-asphericity-and-iol-power-calculation-in-eyes-with-aspherical-iols
#10
Giacomo Savini, Kenneth J Hoffer, Piero Barboni, Domenico Schiano Lomoriello, Pietro Ducoli
PURPOSE: Given that a previous study found that corneal asphericity influences the refractive outcome of intraocular lens (IOL) power calculation by means of thin-lens formulas in eyes with spherical IOLs, the authors aimed to verify whether such influence can also be observed in eyes with aspherical IOLs. METHODS: In this retrospective comparative case series, IOL power was calculated with the Haigis, Hoffer Q, Holladay 1, and SRK/T formulas in two groups of eyes undergoing phacoemulsification and implantation of an aspherical IOL (Acrysof SN60WF; Alcon Laboratories, Inc...
July 1, 2017: Journal of Refractive Surgery
https://www.readbyqxmd.com/read/28670106/predicting-the-refractive-outcome-and-accuracy-of-iol-power-calculation-after-phacoemulsification-using-the-srk-t-formula-with-ultrasound-biometry-in-medium-axial-lengths
#11
Yunus Karabela, Mustafa Eliacik, Mehmet Selim Kocabora, Sevil Karaman Erdur, Hakan Baybora
PURPOSE: To evaluate the accuracy of the SRK/T formula using ultrasound (US) biometry in predicting a target postoperative refraction of ±1.00D in eyes with medium axial length (AL) that underwent phacoemulsification. METHODS: The present study was a retrospective analysis, which included 538 eyes with an AL from 22.0 to 24.60 mm that underwent phacoemulsification and foldable intraocular lens (IOL) implantation (six different IOLs) in the bag. Preoperative AL was measured by US biometry and IOL power (IOLp) was calculated with the SRK/T formula...
2017: Clinical Ophthalmology
https://www.readbyqxmd.com/read/28634928/comparison-of-formulas-and-methods-for-high-myopia-patients-requiring-intraocular-lens-powers-less-than-six-diopters
#12
Harry S Geggel
PURPOSE: To determine the best method to minimize postoperative hyperopia and achieve mild myopia in patients requiring low-powered (<6.00 D) MN60MA intraocular lenses (IOLs). METHODS: This retrospective non-comparative case series consists of 32 eyes (20 patients). Postoperative spherical equivalent (SE) refractions were compared using four methods: standard formulas with varying target refractions (Haigis -1.00 D, Hoffer Q -1.75 D, Holladay 1 -1.50 D and SRK/T -1...
June 20, 2017: International Ophthalmology
https://www.readbyqxmd.com/read/28553547/changes-in-anterior-posterior-and-total-corneal-astigmatism-after-descemet-membrane-endothelial-keratoplasty
#13
Maged Alnawaiseh, Lars Zumhagen, André Rosentreter, Nicole Eter
Purpose. To evaluate changes in anterior, posterior, and total corneal astigmatism in patients after Descemet membrane endothelial keratoplasty (DMEK). Methods. We retrospectively included 29 eyes of 23 patients (age 67.6 ± 9.8 years, 13 female, 10 male) after DMEK surgery. The magnitude and axis orientation of anterior, posterior, and total corneal astigmatism before and after DMEK were determined using a rotating Scheimpflug system (Pentacam HR, Oculus). Results. The magnitude of anterior, posterior, and total corneal astigmatism in the central cornea did not change significantly after surgery...
2017: Journal of Ophthalmology
https://www.readbyqxmd.com/read/28553072/preoperative-measurement-vs-intraoperative-aberrometry-for-the-selection-of-intraocular-lens-sphere-power-in-normal-eyes
#14
James A Davison, Richard Potvin
PURPOSE: This study aimed to assess the value of intraoperative aberrometry (IA) in determining the intraocular lens (IOL) sphere power in eyes with no previous ocular surgery. PATIENTS AND METHODS: We conducted a retrospective review of patients who underwent uncomplicated cataract surgery where standard preoperative (Preop) measurements and IA were performed. Calculated IOL sphere powers and postoperative refractions, both actual and theoretical, were compared based on the measurement method and lens type; lens types included multifocal, toric and aspheric single-vision non-toric IOLs...
2017: Clinical Ophthalmology
https://www.readbyqxmd.com/read/28540007/anterior-chamber-depth-change-following-cataract-surgery-in-pseudoexfoliation-syndrome-a-preliminary-study
#15
Mohammad Reza Fallah Tafti, Hossein Abdollah Beiki, S Farzad Mohammadi, Golshan Latifi, Elham Ashrafi, Zahra Fallah Tafti
PURPOSE: To assess the pseudophakic anterior chamber depth (PP-ACD) or effective lens position (ELP) change after cataract surgery in patients with pseudoexfoliation syndrome (PEX). METHODS: Consecutive eyes with PEX and cataract underwent standard phacoemulsification and were implanted with single-piece acrylic posterior chamber intraocular lenses (IOLs). Eyes with severe PEX and with axial length (AL) greater than 24 mm or less than 22 mm were not included. Eyes with capsular complication or unstable bags that needed capsular tension ring insertion were excluded...
April 2017: Journal of Ophthalmic & Vision Research
https://www.readbyqxmd.com/read/28532935/toric-outcomes-computer-assisted-registration-versus-intraoperative-aberrometry
#16
Jonathan D Solomon, John Ladas
PURPOSE: To compare refractive outcomes of intraoperative computer-assisted registration and intraoperative aberrometry for the reduction of cylinder during toric intraocular lens (IOL) placement. SETTING: Bowie Vision Institute, Bowie, Maryland, USA. DESIGN: Prospective randomized case series. METHOD: The patients were divided into 2 groups that had toric IOL implantation after phacoemulsification. The intraoperative computer-assisted registration group (Group 1) had preoperative toric calculations...
April 2017: Journal of Cataract and Refractive Surgery
https://www.readbyqxmd.com/read/28476316/aberration-free-intraocular-lenses-what-does-this-really-mean
#17
Achim Langenbucher, Simon Schröder, Alan Cayless, Timo Eppig
BACKGROUND: So-called aberration-free intraocular lenses (IOLs) are well established in modern cataract surgery. Usually, they are designed to perfectly refract a collimated light beam onto the focal point. METHODS: We show how much aberration can be expected with such an IOL in a convergent light beam such as that found anterior to the human cornea. Additionally, the aberration in a collimated beam is estimated for an IOL that has no aberrations in the convergent beam...
May 3, 2017: Zeitschrift Für Medizinische Physik
https://www.readbyqxmd.com/read/28464806/the-effect-of-ocular-biometric-factors-on-the-accuracy-of-various-iol-power-calculation-formulas
#18
Jinho Jeong, Han Song, Jimmy K Lee, Roy S Chuck, Ji-Won Kwon
BACKGROUND: To evaluate how differences in ocular biometry affects the Hoffer Q, Holladay 1, SRK/T, and Haigis intraocular lens power calculation formulae predictions. METHODS: This study was performed on 91 eyes of 91 patients who underwent uneventful cataract surgery. Ocular biometry values were measured using the IOL Master 500, and intraocular lens (IOL) power was calculated using the Haigis, Hoffer Q, Holladay 1, and SRK/T formulas. We calculated the expected difference (ED) of each 3rd generation formula from the Haigis formula by subtracting the predicted refraction of the Haigis formula from the predicted refraction of each 3rd generation formula...
May 2, 2017: BMC Ophthalmology
https://www.readbyqxmd.com/read/28444515/cataract-surgery-in-patients-with-a-previous-history-of-kamra-inlay-implantation-a-case-series
#19
Majid Moshirfar, Tyler S Quist, David F Skanchy, Steven H Linn, Jordan Desautels, Phillip C Hoopes
INTRODUCTION: The visual outcome of cataract surgery in patients with a previous history of KAMRA inlay implantation is an emerging issue for which limited research exists. The purpose of this study is to describe postoperative visual outcomes in this patient population. METHODS: This is a case series with retrospective chart review. Seven patients underwent cataract surgery following KAMRA corneal inlay implantation. Visual acuity was assessed before and after cataract surgery...
June 2017: Ophthalmology and Therapy
https://www.readbyqxmd.com/read/28440249/innovations-in-pediatric-cataract-surgery
#20
Sudarshan Kumar Khokhar, Ganesh Pillay, Esha Agarwal, Manish Mahabir
Advances in technology have made surgery in children safer and faster. The management of pediatric cataract has made rapid progress in the past decade with the availability of safer anesthesia, newer technique's, more predictable intraocular lens (IOL) power calculation, a better understanding of neurobiology, genetics, amblyopia management, improved IOL designs for preventing visual axis opacification, and adjuvant postoperative care. Modern vitrectomy machines with minimally invasive instruments, radiofrequency, diathermy, and plasma blades help immensely in complicated cases...
March 2017: Indian Journal of Ophthalmology
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