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https://www.readbyqxmd.com/read/29141385/-clinical-observation-of-visual-quality-after-the-individual-implantation-of-intraocular-lens-guided-by-corneal-q-value
#1
F F Cai, G Y Zheng, H J Wang, L Li, Y Liu
Objective: To describe the feasibility of individual IOL implantation guided by corneal Q value and observe patients postoperative visual quality under different residual spherical aberration. Methods: Prospective study. One hundred and twenty cases (171 eyes)cataract patients in our hospital were selected for the individual implantation of intraocular lens guided by corneal Q value which obtained by Oberscan before operation. Based on spherical aberration calculated by corneal Q value, choose appropriate IOL personalitily to make postoperative whole eye surface aberration +0...
November 11, 2017: [Zhonghua Yan Ke za Zhi] Chinese Journal of Ophthalmology
https://www.readbyqxmd.com/read/29117411/assessing-the-likely-effect-of-posterior-corneal-curvature-on-toric-iol-calculation-for-iols-of-2-50-d-or-greater-cylinder-power
#2
Benjamin R LaHood, Michael Goggin, Adrian Esterman
PURPOSE: To establish whether average refractive overcorrection or undercorrection of corneal astigmatism based on the orientation (rule) of the astigmatism occurs if toric intraocular lenses (IOLs) are calculated on the basis of anterior corneal measurements in eyes requiring toric IOL cylinder power of 2.50 diopters (D) or greater. METHODS: One hundred thirteen consecutive eyes with anterior corneal keratometric astigmatism requiring IOL cylinder power of 2.50 D or greater underwent phacoemulsification with IOL powers calculated using anterior corneal curvature data alone...
November 1, 2017: Journal of Refractive Surgery
https://www.readbyqxmd.com/read/29102605/development-and-clinical-accuracy-of-a-new-iol-power-formula-vrf-compared-to-other-formulas
#3
Oleksiy V Voytsekhivskyy
PURPOSE: To develop and compare the accuracy and reproducibility of the VRF IOL power calculation formula with well-known methods. SETTING: Kiev Clinical Ophthalmology Hospital Eye Microsurgery Center, Kiev, Ukraine. DESIGN: Development and validation study. METHODS: This analysis comprised 823 eyes of 823 patients operated on by one surgeon with three hydrophobic different types of lenses (IQ SN60WF (494 eyes), ReSTOR SN6AD1 (169 eyes), Alcon Labs, Fort Worth, TX, USA and AMO Tecnis MF ZMB00 (160 eyes), J&J, Santa-Ana, CA, USA)...
November 1, 2017: American Journal of Ophthalmology
https://www.readbyqxmd.com/read/29093540/sustained-accuracy-improvement-in-intraocular-lens-power-calculation-with-the-application-of-quality-control-circle
#4
Lei Lin, Pingjun Chang, Jialu Xie, Zhangliang Li, Hongfang Zhang, Fan Lu, Yun-E Zhao
Accurate intraocular lens (IOL) power calculation is always a challenge in ophthalmology, and unoptimized process may lead to inaccurate refractive outcomes. Quality control circle (QCC) has shown its success in many fields as a process management tool. However, its efficacy in ophthalmology remains unclear. Here we utilized the QCC method to optimize the process and evaluate its efficacy in improving the accuracy of IOL power calculation. After the QCC application, the percentage of eyes with achieved refractive outcomes within 0...
November 1, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29090047/accuracy-of-various-intraocular-lens-power-calculation-formulas-in-steep-corneas
#5
Amir Faramarzi, Ali Aghajani, Leila Ghiasian
PURPOSE: To compare the accuracy of four different intraocular lens (IOL) power calculation formulas for eyes with mean keratometry values greater than 46 diopters (D). METHODS: Forty five eyes from 45 patients who were candidates for senile cataract surgery with mean keratometry values greater than 46 D were included. Calculation of the IOL power was performed by the Lenstar. The implanted IOL in all cases was Acrysof SA60AT. The average absolute value of the differences between the actual and predicted spherical equivalent (SE) of the postoperative refractive error (mean absolute error: MAE) was calculated using 4 formulas (Haigis, Holladay 1, Hoffer Q, and SRK/T) with optical IOL constants from the User Group for Laser Interference Biometry constants...
October 2017: Journal of Ophthalmic & Vision Research
https://www.readbyqxmd.com/read/29084004/astigmatism-evaluation-prior-to-cataract-surgery
#6
Pankaj C Gupta, Jane T Caty
PURPOSE OF REVIEW: To evaluate and summarize literature from the past 18 months reporting advancements and issues in astigmatism assessment prior to cataract surgery. RECENT FINDINGS: New and updated toric calculators and regression formulas offer the opportunity for more accurate lens selection for our patients. Concurrently, improvements in topographic evaluation of corneal keratometry have allowed for a decrease in unplanned residual corneal astigmatism. Measuring posterior corneal astigmatism is especially valuable in eyes with keratoconus when planning to implant toric intraocular lens (IOL) and now allows access to this patient population...
October 27, 2017: Current Opinion in Ophthalmology
https://www.readbyqxmd.com/read/29061989/precision-of-a-new-ocular-biometer-in-eyes-with-cataract-using-swept-source-optical-coherence-tomography-combined-with-placido-disk-corneal-topography
#7
Wenwen Wang, Yaxin Miao, Giacomo Savini, Colm McAlinden, Hao Chen, Qingjie Hu, Qinmei Wang, Jinhai Huang
The present study was to assess the precision (repeatability and reproducibility) of a new optical biometer (OA-2000, Tomey, Japan) based on swept-source optical coherence tomography (SS-OCT) and Placido disk topography in eyes with cataracts. Seventy-eight eyes from seventy-eight patients with cataracts were evaluated. Axial length (AL), anterior chamber depth (ACD), keratometry (K) over a 2.5 mm and 3.0 mm diameter, lens thickness (LT), central corneal thickness (CCT) and white-to-white (WTW) distance were measured by 2 skilled operators...
October 23, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29016452/intraocular-lens-position-in-combined-phacoemulsification-and-vitreoretinal-surgery
#8
Serdar Ozates, Hasan Kiziltoprak, Mustafa Koc, Mehmet Murat Uzel, Mehmet Yasin Teke
PURPOSE: To assess the decentration and angle of tilt of the intraocular lens (IOL) according to the intravitreal tamponade types used in combined phacoemulsification and vitreoretinal surgery. METHODS: This prospective and randomized clinical study involved 73 eyes of 69 patients who underwent combined vitreoretinal surgery. Eyes with intravitreal tamponades formed the study group and eyes without intravitreal tamponades formed the control group. The study group was further divided into silicone oil and gas tamponade subgroups...
October 9, 2017: Retina
https://www.readbyqxmd.com/read/28991853/simulated-keratometry-versus-total-corneal-power-by-ray-tracing-a-comparison-in-prediction-accuracy-of-intraocular-lens-power
#9
Giacomo Savini, Kenneth J Hoffer, Domenico Schiano Lomoriello, Pietro Ducoli
PURPOSE: To investigate the relationship between corneal powers measured by simulated keratometry (Sim-K) and ray tracing and understand whether their difference influences intraocular lens (IOL) power calculation. METHODS: In a first sample of healthy eyes, corneal curvature was measured using a rotating Scheimpflug camera (Sirius, CSO). Sim-K was obtained from anterior corneal curvature using the 1.3375 keratometric index. Ray tracing was performed through both corneal surfaces to calculate the total corneal power (TCP)...
November 2017: Cornea
https://www.readbyqxmd.com/read/28991621/central-island-formation-after-cataract-surgery-in-a-laser-in%C3%A2-situ-keratomileusis-eye-new-etiology
#10
Sylvain El-Khoury, Youssef Abdelmassih, George Cherfan, Johnny M Khoury
We report a case of central corneal steepness formation after cataract surgery in a post-laser in situ keratomileusis (LASIK) eye. A 51-year-old woman with traumatic cataract and a history of myopic LASIK surgery had uneventful phacoemulsification cataract surgery. Postoperatively, the corneal topography difference map showed a central island formation of 2.1 diopters (D) compared with the preoperative level, which correlated with a clinical myopic shift of 2.00 D from the targeted emmetropia. At 4 months, most of the central island had resolved spontaneously...
September 2017: Journal of Cataract and Refractive Surgery
https://www.readbyqxmd.com/read/28991609/optimized-keratometry-and-total-corneal-astigmatism-for-toric-intraocular-lens-calculation
#11
Giacomo Savini, Kristian Næser, Domenico Schiano-Lomoriello, Pietro Ducoli
PURPOSE: To compare keratometric astigmatism (KA) and different modalities of measuring total corneal astigmatism (TCA) for toric intraocular lens (IOL) calculation and optimize corneal measurements to eliminate the residual refractive astigmatism. SETTING: G.B. Bietti Foundation IRCCS, Rome, Italy. DESIGN: Prospective case series. METHODS: Patients who had a toric IOL were enrolled. Preoperatively, a Scheimpflug camera (Pentacam HR) was used to measure TCA through ray tracing...
September 2017: Journal of Cataract and Refractive Surgery
https://www.readbyqxmd.com/read/28991337/accuracy-of-a-new-swept-source-optical-coherence-tomography-biometer-for-iol-power-calculation-and-comparison-to-iolmaster
#12
Giacomo Savini, Kenneth J Hoffer, H John Shammas, Jaime Aramberri, Jinhai Huang, Piero Barboni
PURPOSE: To investigate the accuracy of the measurements provided by a new optical biometer (OA-2000, Tomey Corporation, Nagoya, Japan) for calculating the intraocular lens (IOL) power and to compare the refractive outcomes to those obtained with the IOLMaster 500 (Carl Zeiss Meditec, Jena, Germany). METHODS: In this interventional multicenter study, consecutive patients having cataract surgery were enrolled. Only the IOL model used in the largest sample of patients was selected and the eyes implanted with that IOL were subsequently analyzed...
October 1, 2017: Journal of Refractive Surgery
https://www.readbyqxmd.com/read/28961565/cataract-surgery-in-eyes-with-keratoconus-a-review-of-the-current-literature
#13
Majid Moshirfar, Brian D Walker, Orry C Birdsong
PURPOSE OF REVIEW: There are an increasing number of keratoconic eyes, requiring cataract surgery. We review the preoperative planning, intraoperative options, and postoperative management that aid in successful outcomes. RECENT FINDINGS: Management of keratoconic eyes requiring cataract surgery requires a multifaceted approach. Preoperatively, corneal crosslinking and intrastromal corneal ring segments can be considered in order to provide stable keratometry values for intraocular lens (IOL) calculations...
September 28, 2017: Current Opinion in Ophthalmology
https://www.readbyqxmd.com/read/28951074/accuracy-of-intraocular-lens-calculation-formulas
#14
Ronald B Melles, Jack T Holladay, William J Chang
PURPOSE: To compare the accuracy of intraocular lens (IOL) calculation formulas (Barrett Universal II, Haigis, Hoffer Q, Holladay 1, Holladay 2, Olsen, and SRK/T) in the prediction of postoperative refraction using a single optical biometry device. DESIGN: Retrospective consecutive case series. PARTICIPANTS: A total of 13 301 cataract operations with an AcrySof SN60WF implant and 5200 operations with a SA60AT implant (Alcon Laboratories, Inc...
September 23, 2017: Ophthalmology
https://www.readbyqxmd.com/read/28945644/effects-of-contact-lens-wear-on-biometry-measurements-for-intraocular-lens-calculations
#15
Jay J Meyer, Michelle J Kim, Terry Kim
OBJECTIVES: To determine the effects of contact lens (CL) wear on biometry measurements for cataract surgery and whether a CL hiatus can reduce the prediction error of intraocular lens (IOL) calculations. METHODS: Retrospective, interventional case series of eyes that received repeat biometry measurements for IOL calculations after discontinuing hard or soft CLs for at least 14 days. PRIMARY OUTCOME MEASURES: intersession change in axial length, average keratometry, astigmatism, and axis...
September 21, 2017: Eye & Contact Lens
https://www.readbyqxmd.com/read/28917408/refractive-outcome-comparison-between-vitreomacular-interface-disorders-after-phacovitrectomy
#16
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
#17
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
#18
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
#19
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
#20
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 22 mm from previously reported studies...
September 9, 2017: Clinical & Experimental Ophthalmology
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