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https://www.readbyqxmd.com/read/29615113/intraocular-lens-power-calculation-for-the-equine-eye
#1
Ulrike Meister, Christiane Görig, Christopher J Murphy, Hubertus Haan, Bernhard Ohnesorge, Michael H Boevé
BACKGROUND: Phacoemulsification and intraocular lens (IOL) implantation during cataract surgery in horses occur with increasing frequency. To reduce the postoperative refractive error it is necessary to determine the proper IOL power. In the present study retinoscopy, keratometry and ultrasonographic biometry were performed on 98 healthy equine eyes from 49 horses. The refractive state, corneal curvature (keratometry) and the axial location of all optical interfaces (biometry) were measured...
April 3, 2018: BMC Veterinary Research
https://www.readbyqxmd.com/read/29607215/calculation-of-unknown-preoperative-k-readings-in-postrefractive-surgery-patients
#2
Nicola Rosa, Maddalena De Bernardo, Maria Borrelli
Purpose: To determine the unknown preoperative K readings (Kpre) to be used in history-based methods, for intraocular lens (IOL) power calculation in patients who have undergone myopic photorefractive keratectomy (PRK). Methods: A regression formula generated from the left eyes of 174 patients who had undergone PRK for myopia or for myopic astigmatism was compared with other methods in 168 right eyes. The Pearson index and paired t -test were utilized for statistical analysis...
2018: Journal of Ophthalmology
https://www.readbyqxmd.com/read/29605815/predictability-of-formulae-for-intraocular-lens-power-calculation-according-to-the-age-of-implantation-in-paediatric-cataract
#3
Byung Joo Lee, Sang-Mok Lee, Jeong Hun Kim, Young Suk Yu
AIMS: To analyse the predictability of diverse intraocular lens (IOL) power calculation formulae in paediatric patients with congenital cataract. METHODS: The medical records of patients who underwent cataract surgery and posterior chamber IOL implantation (in-the-bag) for congenital cataract before 17 years of age were reviewed retrospectively. Target refractions calculated by Sanders-Retzlaff-Kraff (SRK)/II, SRK/T and Hoffer-Q formulae were compared with the actual refraction...
March 31, 2018: British Journal of Ophthalmology
https://www.readbyqxmd.com/read/29587976/effect-of-supplementary-implantation-of-a-sulcus-fixated-intraocular-lens-in-patients-with-negative-dysphotopsia
#4
Natalia Y Makhotkina, Vincent Dugrain, Daniel Purchase, Tos T J M Berendschot, Rudy M M A Nuijts
PURPOSE: To evaluate whether the outcome of negative dysphotopsia treatment by implantation of a Sulcoflex intraocular lens (IOL) can be understood using individual biometry and optical modeling data. SETTING: University Eye Clinic, Maastricht University Medical Centre, Maastricht, the Netherlands. DESIGN: Retrospective case series. METHODS: Patients with negative dysphotopsia were treated with supplementary implantation of a sulcus-fixated IOL...
February 2018: Journal of Cataract and Refractive Surgery
https://www.readbyqxmd.com/read/29564411/comparison-of-okulix-ray-tracing-software-with-srk-t-and-hoffer-q-formula-in-intraocular-lens-power-calculation
#5
Mohammad Ghoreyshi, Ahmadreza Khalilian, Mohammadreza Peyman, Mohaddeseh Mohammadinia, Alireza Peyman
Purpose: To compare the performance of OKULIX ray-tracing software with SRK-T and Hoffer Q formula in intraocular lens (IOL) power calculation in patients presenting with cataract. Methods: In this prospective study, 104 eyes of 104 patients with cataract who underwent phacoemulsification and IOL implantation were recruited. Three IOL brands were used and for all eyes, IOL power calculation was performed using SRK-T, Hoffer Q formula and also OKULIX ray-tracing software...
March 2018: Journal of Current Ophthalmology
https://www.readbyqxmd.com/read/29545950/comparison-of-two-toric-iol-calculation-methods
#6
C Kern, K Kortüm, M Müller, A Kampik, S Priglinger, W J Mayer
Purpose: To compare two calculators for toric intraocular lens (IOL) calculation and to evaluate the prediction of refractive outcome. Methods: Sixty-four eyes of forty-five patients underwent cataract surgery followed by implantation of a toric intraocular lens (Zeiss Torbi 709 M) calculated by a standard industry calculator using front keratometry values. Prediction error, median absolute error, and refractive astigmatism error were evaluated for the standard calculator...
2018: Journal of Ophthalmology
https://www.readbyqxmd.com/read/29543854/comparison-of-axial-length-anterior-chamber-depth-and-intraocular-lens-power-between-iolmaster-and-ultrasound-in-normal-long-and-short-eyes
#7
Jing Dong, Yaqin Zhang, Haining Zhang, Zhijie Jia, Suhua Zhang, Xiaogang Wang
PURPOSE: To compare the axial length (AL), anterior chamber depth (ACD) and intraocular lens power (IOLP) of IOLMaster and Ultrasound in normal, long and short eyes. METHODS: Seventy-four normal eyes (≥ 22 mm and ≤ 25 mm), 74 long eyes (> 25 mm) and 78 short eyes (< 22 mm) underwent AL and ACD measurements with both devices in the order of IOLMaster followed by Ultrasound. The IOLP were calculated using a free online LADAS IOL formula calculator. RESULTS: The difference in AL and IOLP between IOLMaster and Ultrasound was statistically significant when all three groups were combined...
2018: PloS One
https://www.readbyqxmd.com/read/29527012/accuracy-of-intraocular-lens-power-calculation-using-three-optical-biometry-measurement-devices-the-oa-2000-lenstar-ls900-and-iolmaster-500
#8
Olga Reitblat, Adi Levy, Guy Kleinmann, Ehud I Assia
PURPOSE: To compare ocular measurements of three optical biometry devices and their application in intraocular lens (IOL) power calculations. METHODS: One hundred and forty eyes which had undergone cataract extraction surgery with preoperative biometry with OA--2000, IOLMaster-500, and Lenstar-LS900 were enrolled. Biometry measurements of the three devices were compared. The deviation of the postoperative refraction from the preoperative refractive target was calculated with different formulas (Barrett Universal II, Hoffer Q, Holladay I, and SRK/T)...
March 12, 2018: Eye
https://www.readbyqxmd.com/read/29525618/new-algorithm-for-toric-intraocular-lens-power-calculation-considering-the-posterior-corneal-astigmatism
#9
Carmen Canovas, Aixa Alarcon, Robert Rosén, Sanjeev Kasthurirangan, Joseph J K Ma, Douglas D Koch, Patricia Piers
PURPOSE: To assess the accuracy of toric intraocular lens (IOL) power calculations of a new algorithm that incorporates the effect of posterior corneal astigmatism (PCA). SETTING: Abbott Medical Optics, Inc., Groningen, the Netherlands. DESIGN: Retrospective case report. METHODS: In eyes implanted with toric IOLs, the exact vergence formula of the Tecnis toric calculator was used to predict refractive astigmatism from preoperative biometry, surgeon-estimated surgically induced astigmatism (SIA), and implanted IOL power, with and without including the new PCA algorithm...
March 7, 2018: Journal of Cataract and Refractive Surgery
https://www.readbyqxmd.com/read/29525614/intraocular-lens-power-adjustment-by-a-femtosecond-laser-in-vitro-evaluation-of-power-change-modulation-transfer-function-light-transmission-and-light-scattering-in-a-blue-light-filtering-lens
#10
Jason Nguyen, Liliana Werner, Jason Ludlow, Joah Aliancy, Larry Ha, Bryan Masino, Sean Enright, Ray K Alley, Ruth Sahler
PURPOSE: To evaluate intraocular lens (IOL) power, modulation transfer function (MTF), light transmission, and light scattering of a blue light-filtering IOL before and after power adjustment by a femtosecond laser obtained through increased hydrophilicity of targeted areas within the optic, creating the ability to build a refractive-index-shaping lens within an existing IOL. SETTING: John A. Moran Eye Center, University of Utah, Salt Lake City, Utah, USA. DESIGN: Experimental study...
March 7, 2018: Journal of Cataract and Refractive Surgery
https://www.readbyqxmd.com/read/29514611/prospective-study-of-bilateral-mix-and-match-implantation-of-diffractive-multifocal-intraocular-lenses-in-koreans
#11
Chan Min Yang, Dong Hui Lim, Sungsoon Hwang, Joo Hyun, Tae-Young Chung
BACKGROUND: To evaluate monocular and binocular visual outcomes for near, intermediate, and far distance in patients implanted with diffractive multifocal intraocular lenses (IOLs) with different add power contralaterally. METHODS: This is a prospective contralateral study. Two diffractive multifocal IOLs with different added power were implanted bilaterally in twenty patients. TECNIS® ZKB00 (+ 2.75 D) was implanted in a dominant eye, and TECNIS® ZLB00 (+ 3...
March 7, 2018: BMC Ophthalmology
https://www.readbyqxmd.com/read/29508566/influence-of-material-and-haptic-design-on-the-mechanical-stability-of-intraocular-lenses-by-means-of-finite-element-modeling
#12
Laura Remón, Damian Siedlecki, Iulen Cabeza-Gil, Begoña Calvo
Intraocular lenses (IOLs) are used in the cataract treatment for surgical replacement of the opacified crystalline lens. Before being implanted they have to pass the strict quality control to guarantee a good biomechanical stability inside the capsular bag, avoiding the rotation, and to provide a good optical quality. The goal of this study was to investigate the influence of the material and haptic design on the behavior of the IOLs under dynamic compression condition. For this purpose, the strain-stress characteristics of the hydrophobic and hydrophilic materials were estimated experimentally...
March 2018: Journal of Biomedical Optics
https://www.readbyqxmd.com/read/29502613/wang-koch-formula-for-optimization-of-intraocular-lens-power-calculation-evaluation-at-a-canadian-center
#13
Marko Popovic, Matthew B Schlenker, Xavier Campos-Möller, Austin Pereira, Iqbal Ike K Ahmed
PURPOSE: To externally validate the Wang-Koch method for optimization of intraocular lens (IOL) formulas. SETTING: TLC Laser Eye Centre, Mississauga, Ontario, Canada. DESIGN: Retrospective case series. METHODS: Consecutive cataract patients with an axial length (AL) of 25.0 mm or longer were recruited. The predicted postoperative spherical equivalents (SEs) calculated from the Holladay 1 formula were compared with the 3-week postoperative SEs to yield prediction errors for Wang-Koch adjusted and unadjusted ALs...
January 2018: Journal of Cataract and Refractive Surgery
https://www.readbyqxmd.com/read/29498180/accuracy-of-intraocular-lens-power-calculation-formulas-in-long-eyes-a-systematic-review-and-meta-analysis
#14
Qiwei Wang, Wu Jiang, Tiao Lin, Yi Zhu, Chuan Chen, Haotian Lin, Weirong Chen
IMPORTANCE: Visual outcome after intraocular lens (IOL) implantation in long eyes is considerably affected by IOL power calculation. Various formulas have been designed to achieve an accurate IOL power prediction. However, controversy about the accuracy remains. BACKGROUND: To evaluate the accuracy of IOL power calculation formulas in long eyes. DESIGN: Meta-analysis. PARTICIPANTS: Patients with ocular axial length (AL) over 24...
March 2, 2018: Clinical & Experimental Ophthalmology
https://www.readbyqxmd.com/read/29459040/interocular-axial-length-and-corneal-power-differences-as-predictors-of-postoperative-refractive-outcomes-after-cataract-surgery
#15
Vinay Kansal, Matthew Schlenker, Iqbal Ike K Ahmed
PURPOSE: To determine whether differences between eyes in axial length (AL) and corneal power (K) on optical biometry are predictive of refractive outcomes. DESIGN: Retrospective cohort study. PARTICIPANTS: A total of 729 patients (1458 eyes) who underwent bilateral phacoemulsification at TLC (Mississauga, Ontario, Canada) from September 2013 to August 2015. METHODS: We compared the proportion of patients having >0...
February 16, 2018: Ophthalmology
https://www.readbyqxmd.com/read/29450545/use-of-the-posterior-anterior-corneal-curvature-radii-ratio-to-improve-the-accuracy-of-intraocular-lens-power-calculation-eom-s-adjustment-method
#16
Mingue Kim, Youngsub Eom, Hwa Lee, Young-Woo Suh, Jong Suk Song, Hyo Myung Kim
Purpose: To evaluate the accuracy of IOL power calculation using adjusted corneal power according to the posterior/anterior corneal curvature radii ratio. Methods: Nine hundred twenty-eight eyes from 928 reference subjects and 158 eyes from 158 cataract patients who underwent phacoemulsification surgery were enrolled. Adjusted corneal power of cataract patients was calculated using the fictitious refractive index that was obtained from the geometric mean posterior/anterior corneal curvature radii ratio of reference subjects and adjusted anterior and predicted posterior corneal curvature radii from conventional keratometry (K) using the posterior/anterior corneal curvature radii ratio...
February 1, 2018: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/29426763/-toric-lens-implantation-in-cataract-surgery-automatic-versus-manual-horizontal-axis-marking-analysis-of-50%C3%A2-cases
#17
M Raucau, H El Chehab, E Agard, C Lagenaite, C Dot
SUBJECT: The main objective of our study is to evaluate the contribution of automated conjunctival recognition in the alignment of toric implants by comparing the automatic alignment optimized with Callisto™ to the manual marking of the horizontal axis. MATERIALS AND METHODS: We performed a prospective, descriptive, and monocentric study on patients undergoing cataract surgery with toric implantation (Asphina 709 Zeiss), operated by a surgeon with good experience in toricity, between September 2016 and March 2017...
February 6, 2018: Journal Français D'ophtalmologie
https://www.readbyqxmd.com/read/29403584/visual-outcomes-and-refractive-status-after-combined-silicone-oil-removal-cataract-surgery-with-intraocular-lens-implantation
#18
Hussain F Al-Habboubi, Waseem Al-Zamil, Ali A Al-Habboubi, Rajiv Khandekar
Purpose: To evaluate refractive status and identify predictors of surgical success following a combined silicone oil removal/cataract surgery with intraocular lens (IOL) implantation procedure. Methods: In this single-armed, retrospective study, we reviewed patients who underwent vitreoretinal surgery followed by a combined silicone oil removal/cataract surgery procedure between 2009 and 2013. Preoperative data included patient demographics, refractive status, IOL power, and axial length (measured with the IOL Master)...
January 2018: Journal of Ophthalmic & Vision Research
https://www.readbyqxmd.com/read/29392640/corneal-incision-architecture-after-iol-implantation-with-three-different-injectors-an-environmental-scanning-electron-microscopy-study
#19
Rita Mencucci, Eleonora Favuzza, Maria Cristina Salvatici, Leopoldo Spadea, David Allen
PURPOSE: To evaluate by Environmental Scanning Electron Microscopy (ESEM) the corneal incision architecture after intraocular lens (IOL) implantation in pig eyes, using manual, automated injectors or preloaded delivery systems. METHODS: Twenty-four pig eyes underwent IOL implantation in the anterior chamber using three different injectors: manual (Monarch III) (n = 8), automated (AutoSert) (n = 8), or a preloaded system (UltraSert) (n = 8). Acrysof IQ IOLs, 21 Dioptres (D) (n = 12) and 27D (n = 12), were implanted through 2...
February 1, 2018: International Ophthalmology
https://www.readbyqxmd.com/read/29391575/the-effect-of-the-timing-of-the-cessation-of-contact-lens-use-on-the-results-of-biometry
#20
Colin Goudie, Andrew Tatham, Rhys Davies, Alison Sifton, Mark Wright
BACKGROUND: Current guidelines vary regarding when to remove contact lenses prior to performing biometry, and there is no clear evidence behind these guidelines. This study aimed to determine the effect of soft contact lens wear on biometric measurements by examining the change in predicted lens power for emmetropia at several time points following removal of soft contact lenses. METHODS: A prospective, controlled study of healthy soft contact lens wearers. Biometry was performed immediately after removing contact lenses and then after 2, 4 and 7 days of no contact lens use...
February 2, 2018: Eye
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