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Axial biometry

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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/28778114/comparison-of-hill-rbf-barrett-universal-and-current-third-generation-formulas-for-the-calculation-of-intraocular-lens-power-during-cataract-surgery
#2
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/28777384/changes-in-anterior-ocular-structures-and-macula-following-deep-sclerectomy-with-collagen-implant
#3
Sakari M A Suominen, Mika P Harju, Asta M E Hautamäki, Eija T Vesti
PURPOSE: To determine the effect of intraocular pressure (IOP) lowering with deep sclerectomy (DS) on visual acuity, macular structures, and anterior ocular dimensions during the early postoperative period. METHODS: We prospectively analyzed 35 eyes of 35 patients scheduled for DS. Our focus with the measurements was on early postoperative changes in anterior ocular and macular structures related to IOP lowering during the first month after DS. In addition to a clinical ophthalmologic examination, our measurements included corneal topography, measurement of ocular dimensions with optical biometry, and examination of macular structure with optical coherence tomography...
August 2, 2017: European Journal of Ophthalmology
https://www.readbyqxmd.com/read/28776594/the-inner-retinal-structures-of-the-eyes-of-children-with-a-history-of-retinopathy-of-prematurity
#4
Y-S Lee, S H L Chang, S-C Wu, L-C See, S-H Chang, M-L Yang, W-C Wu
PurposeTo investigate the microstructural differences of the inner retina in the peripapillary and macular areas in children with or without retinopathy of prematurity (ROP).MethodsThis prospective cohort study included school-age children with a history of ROP and age-matched healthy, full-term children. The macular ganglion cell complex (mGCC), peripapillary retinal nerve fiber layer (RNFL), refractive status, and ocular biometry were measured. The metrics of the mGCC and associated anatomical changes were the primary outcomes...
August 4, 2017: Eye
https://www.readbyqxmd.com/read/28774525/v4b-implantable-collamer-lens-versus-intacs-corneal-rings-to-manage-anisometropic-myopic-amblyopia-in-children
#5
Sherif Ahmed Eissa, Mohamed Wagih El-Deeb, Mahmoud Salah Hendawi
OBJECTIVE: To compare the safety and efficacy of phakic intraocular lens (PIOL) versus intrastromal corneal ring segments (Intacs), for correcting high myopic anisometropia in amblyopic children. DESIGN: Nonrandomized prospective multi-center study. PARTICIPANTS: Thirty children, aged between 4 and 12 years, with unilateral high myopic anisometropic amblyopia were included in this study. METHODS: Patients who were prospectively subdivided into group A, with mean preoperative manifest refraction spherical equivalent (MRSE) of -12...
August 2017: Canadian Journal of Ophthalmology. Journal Canadien D'ophtalmologie
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
#6
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/28671340/physical-activity-and-myopia-in-danish-children-the-champs-eye-study
#7
Kristian Lundberg, Anne Suhr Thykjaer, Rasmus Søgaard Hansen, Anders Højslet Vestergaard, Nina Jacobsen, Ernst Goldschmidt, Rodrigo Antunes Lima, Tunde Peto, Niels Wedderkopp, Jakob Grauslund
PURPOSE: To determine associations between physical activity (PA) and myopia in Danish school children and investigate the prevalence of myopia. METHODS: This is a prospective study with longitudinal data on PA in a Danish child cohort. Physical activity (PA) was measured objectively by repeated ActiGraph accelerometer measurement four times with different intervals (1-2.5 years) at the mean ages 9.7, 11.0, 12.9 and 15.4 years. Mean intensity of PA was estimated as counts/minutes, and time spent in sedentary, light, moderate and vigorous PA was summed using defined cut-off points...
July 3, 2017: Acta Ophthalmologica
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
#8
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/28663900/assessment-of-eye-length-changes-in-accommodation-using-dynamic-extended-depth-oct
#9
Yu-Cherng Chang, Keke Liu, Carolina de Freitas, Alex Pham, Florence Cabot, Siobhan Williams, Ethan Adre, Giovanni Gregori, Marco Ruggeri, Sonia H Yoo, Arthur Ho, Jean-Marie Parel, Fabrice Manns
It has been suggested that accommodation induces increases in axial eye length which could contribute to the development of myopia. However, it is debated whether changes in eye length occur during accommodation as the degree of change varies widely across literature. In this study, an extended-depth optical coherence tomography (OCT) system that provides dynamic whole eye biometry was utilized to assess changes in lens thickness (LT) and axial eye length (AEL) in young subjects responding to step disaccommodation stimuli of amplitude 2D, 4D, and 6D...
May 1, 2017: Biomedical Optics Express
https://www.readbyqxmd.com/read/28654694/ethnic-differences-in-lens-parameters-measured-by-ocular-biometry-in-a-cataract-surgery-population
#10
Dajiang Wang, Behzad Amoozgar, Travis Porco, Zhen Wang, Shan C Lin
PURPOSE: To investigate whether differences exist in lens position and other lens parameters among major ethnic groups with cataractous eyes, which may help explain racial differences in angle closure risk. METHODS: This retrospective, cross-sectional study included 807 adult patients who had cataract surgery between years 2014 and 2016 at the University of California, San Francisco (UCSF). Adult patients of white, Asian, Hispanic and African-American ethnicity were included...
2017: PloS One
https://www.readbyqxmd.com/read/28639087/haigis-and-srkt-formulae-accuracy-for-intentional-myopic-overcorrection
#11
Rodrigo Faeda Dalto, Miriam A Ferreira, Wilian Queiroz, Roberto Pinto Coelho, Jayter Silva Paula, Andre Messias
PURPOSE: To investigate the influence of preoperative biometric parameters on the accuracy of Haigis and SRKT formulae in predicting postoperative target refraction. METHODS: Retrospective analysis of 108 eyes (70 patients) underwent uneventful phacoemulsification surgery with implant of Alcon-SN60WF intraocular lens (IOL). Forty-five eyes were intentionally targeted to myopia (-0.75 to -1.25 dpt), while the others targeted between 0 and -0.75 dpt. Preoperative axial length and keratometry (K) were measured with optical biometry (LENSTAR-Haag-Streit)...
June 21, 2017: International Ophthalmology
https://www.readbyqxmd.com/read/28622398/axial-length-variation-impacts-on-superficial-retinal-vessel-density-and-foveal-avascular-zone-area-measurements-using-optical-coherence-tomography-angiography
#12
Danuta M Sampson, Peijun Gong, Di An, Moreno Menghini, Alex Hansen, David A Mackey, David D Sampson, Fred K Chen
Purpose: To evaluate the impact of image magnification correction on superficial retinal vessel density (SRVD) and foveal avascular zone area (FAZA) measurements using optical coherence tomography angiography (OCTA). Methods: Participants with healthy retinas were recruited for ocular biometry, refraction, and RTVue XR Avanti OCTA imaging with the 3 × 3-mm protocol. The foveal and parafoveal SRVD and FAZA were quantified with custom software before and after correction for magnification error using the Littman and the modified Bennett formulae...
June 1, 2017: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/28569566/ocular-biometry-and-determinants-of-refractive-error-in-a-founder-population-of-european-ancestry
#13
Sarah M Hilkert, Reut Parness-Yossifon, Rebecca Mets-Halgrimson, Marilyn B Mets
BACKGROUND: The prevalence of myopia is increasing worldwide. Previous studies have found a positive association between myopia, education, and near activities, while others have noted a negative association with outdoor exposure. This study reports refractive error and biometry in a founder population of European ancestry, the Hutterites, and discusses risk factors contributing to myopia. METHODS: Cross-sectional study, including complete eye exams with retinoscopy and biometry...
June 1, 2017: Ophthalmic Genetics
https://www.readbyqxmd.com/read/28532936/intraoperative-aberrometry-versus-preoperative-biometry-for-intraocular-lens-power-selection-in-axial-myopia
#14
Darren C Hill, Shruti Sudhakar, Christopher S Hill, Tonya S King, Ingrid U Scott, Brett B Ernst, Seth M Pantanelli
PURPOSE: To compare the accuracy of intraoperative wavefront aberrometry (ORA) and the Hill-radial basis function (RBF) formula with other formulas based on preoperative biometry in predicting residual refractive error after cataract surgery in eyes with axial myopia. SETTING: Private practice, Harrisburg, Pennsylvania, USA. DESIGN: Retrospective consecutive case series. METHODS: Eyes with an axial length (AL) greater than 25...
April 2017: Journal of Cataract and Refractive Surgery
https://www.readbyqxmd.com/read/28464806/the-effect-of-ocular-biometric-factors-on-the-accuracy-of-various-iol-power-calculation-formulas
#15
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/28448513/outdoor-activity-and-myopia-progression-in-4-year-follow-up-of-chinese-primary-school-children-the-beijing-children-eye-study
#16
Yin Guo, Li Juan Liu, Ping Tang, Yan Yun Lv, Yi Feng, Liang Xu, Jost B Jonas
PURPOSE: To investigate factors associated with ocular axial elongation and myopia progression during a 4-year follow-up in primary school children in Beijing. METHODS: This school-based study included 382 grade-1 children at baseline in 2011 (age:6.3±0.4 years) with 305 (79.8%) returning for the follow-up examination in 2015. At baseline and in yearly follow-up examinations, the children underwent a comprehensive eye examination including auto-refractometry, ocular biometry with measurement of axial length, and fundus photography...
2017: PloS One
https://www.readbyqxmd.com/read/28446167/evaluation-of-biometry-and-corneal-astigmatism-in-cataract-surgery-patients-from-central-china
#17
Ji-Guo Yu, Jie Zhong, Zhong-Ming Mei, Fang Zhao, Na Tao, Yi Xiang
BACKGROUND: To evaluate the distribution of biometric parameters and corneal astigmatism using the IOLMaster device before phacoemulsification in cataract patients in Central China. METHODS: Consecutive cataract patients were recruited at the Central Hospital of Wuhan between January 2015 and June 2016. Ocular axial length (AL), keratometry values, anterior chamber depth (ACD) and horizontal corneal diameter (white to white [WTW]) of each cataract-affected eye were measured with the IOLMaster device...
April 26, 2017: BMC Ophthalmology
https://www.readbyqxmd.com/read/28402713/optical-biometry-derived-axial-length-measurements-following-intravitreal-anti-vascular-endothelial-growth-factor-treatment-for-macular-edema
#18
George D Kymionis, Athanassios Giarmoukakis, Ioanna K Apostolidi, Styliani V Blazaki, Konstantinos I Tsoulnaras, Joanna Moschandrea, Sofia Panagopoulou, Miltiadis K Tsilimbaris
PURPOSE: To evaluate axial length (AL) alterations in patients with macular disease over the course of intravitreal anti-vascular endothelial growth factor (anti-VEGF) treatment. METHODS: In this prospective, comparative study, 33 patients with macular edema underwent unilaterally intravitreal anti-VEGF therapy and were followed for two months; the contralateral eyes were considered as controls. Central retinal thickness (CRT) was measured with spectral-domain optical coherence tomography and AL with an IOL-Master optical biometer...
April 12, 2017: Seminars in Ophthalmology
https://www.readbyqxmd.com/read/28366366/clinical-and-biometric-determinants-of-actual-lens-position-after-cataract-surgery
#19
Julien Plat, Didier Hoa, Frederic Mura, Timothe Busetto, Christelle Schneider, Arnaud Payerols, Max Villain, Vincent Daien
PURPOSE: To evaluate the preoperative clinical and biometric determinants associated with the actual lens position after cataract surgery. SETTING: Department of Ophthalmology, University Hospital of Montpellier, France. DESIGN: Prospective longitudinal cohort study. METHODS: The data collected included clinical factors (age, sex, history of vitrectomy) and biometry factors (axial length [AL], anterior chamber depth [ACD], lens thickness, white-to-white [WTW] distance) that might affect actual lens position...
February 2017: Journal of Cataract and Refractive Surgery
https://www.readbyqxmd.com/read/28357135/circumferential-silicone-sponge-scleral-buckling-induced-axial-length-changes-case-series-and-comparison-to-literature
#20
Shira Sheen Ophir, Asaf Friehmann, Alexander Rubowitz
BACKGROUND: This study compared axial length changes induced by circumferential scleral buckling using a silicone sponge with literature reports for solid silicone rubber. METHODS: Records of patients treated with scleral buckling in 2009-2013 using a silicone sponge, with preoperative axial length biometry measurements were reviewed. Additional information included age, type of surgery, additional surgeries, phakic status and anatomical success of reattachment...
2017: International Journal of Retina and Vitreous
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