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Axial biometry

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https://www.readbyqxmd.com/read/29297794/the-eye-of-the-azara-s-agouti-dasyprocta-azarae-morphological-observations-and-selected-ophthalmic-diagnostic-tests
#1
André Tavares-Somma, Nathália Seabra, Bret A Moore, Mario Sato, Rogério R Lange, Fabiano Montiani-Ferreira
The purpose of this study was to carry out a descriptive investigation of the Azara's agouti ( Dasyprocta azarae) eye and to establish reference values of select ophthalmic diagnostic tests and physiologic parameters. A total of 19 healthy agoutis were used. Select ophthalmic diagnostic tests were performed, including Schirmer tear test type I (STTI), analysis of the conjunctival bacterial microflora, corneal esthesiometry, and tonometry. B-mode ultrasonic biometry, fundus photography, optical coherence tomography, and gross and histologic analysis of two eyes were also performed...
December 2017: Journal of Zoo and Wildlife Medicine: Official Publication of the American Association of Zoo Veterinarians
https://www.readbyqxmd.com/read/29285779/analysing-the-ocular-biometry-of-new-born-infants
#2
Jos J Rozema, Zvi Herscovici, Moshe Snir, Ruth Axer-Siegel
PURPOSE: To model and analyse the ocular biometry of new-born infants. METHODS: This work is based on previously published data of a cohort of 66 new-born infants aged 0-3 days. After exclusion of seven myopic subjects, the available retinoscopy, keratometry and ultrasound biometry data were analysed, along with calculated parameters such as lens power and whole eye power. RESULTS: Male infants have significantly flatter corneas that female infants (Mann-Whitney U test, p < 0...
December 29, 2017: Ophthalmic & Physiological Optics: the Journal of the British College of Ophthalmic Opticians (Optometrists)
https://www.readbyqxmd.com/read/29285706/comparison-of-anterior-segment-parameters-and-axial-lengths-of-myopic-emmetropic-and-hyperopic-children
#3
Mehmethan Dogan, Ufuk Elgin, Emine Sen, Kemal Tekin, Pelin Yilmazbas
PURPOSE: To compare the anterior segment parameters of myopic, hyperopic, and emmetropic children by using optical biometry. METHODS: This prospective cross-sectional study included 150 eyes of 150 children between 6 and 16 years old. The eyes were divided into three groups according to their spherical equivalent (SE) refractive error values as myopic [between - 1.0 and - 6.0 diopter (D)], emmetropic (between + 0.50 and - 0.50 D), and hyperopic (between + 1...
December 29, 2017: International Ophthalmology
https://www.readbyqxmd.com/read/29260498/ocular-biometric-changes-with-different-accommodative-stimuli-using-swept-source-optical-coherence-tomography
#4
Teresa Ferrer-Blasco, José J Esteve-Taboada, Daniel Monsálvez-Romín, Miguel A Aloy, José E Adsuara, Pablo Cerdá-Durán, Robert Montés-Micó
PURPOSE: To evaluate ocular biometric changes with different accommodative stimuli using a new swept-source optical biometer. METHODS: Only the right eye was analyzed. Each subject was measured six times with the IOLMaster 700 swept-source optical biometer (Carl Zeiss Meditec, Jena, Germany) with the subject looking at the stimulus shown by the instrument and with the subject looking at a target placed outside the instrument at 0D of vergence. Axial length (AL), anterior chamber depth (ACD), central corneal thickness (CCT), lens thickness (LT), white-to-white (WTW), and keratometry readings (K1 and K2) were evaluated in both cases...
December 19, 2017: International Ophthalmology
https://www.readbyqxmd.com/read/29228915/qualitative-and-quantitative-evaluation-of-acute-angle-closure-mechanisms
#5
Yanin Suwan, Sunpong Jiamsawad, Apichat Tantraworasin, Lawrence Geyman, Wasu Supakontanasan, Chaiwat Teekhasaenee
BACKGROUND: To evaluate ocular biometric parameters in different subtypes of acute angle closure and compared to fellow eyes of AAC and PACS eyes. METHODS: This is a retrospective chart review study. A total of 167 eyes (96 patients) consisting of 71 AAC eyes, 71 fellow eyes of AAC, and 25 PACS eyes were recruited. All patients underwent ocular examination and biometry. The mechanism of AAC was confirmed by ultrasound biomicroscopy. We then subdivided AAC eyes into four subgroups: crowded-angle (CR), lens subluxation (LS) pupillary block (PB), and plateau iris syndrome (PL)...
December 11, 2017: BMC Ophthalmology
https://www.readbyqxmd.com/read/29163989/axial-length-and-ocular-development-of-premature-infants-without-rop
#6
Yi Zha, Guangdong Zhu, Jinfei Zhuang, Haihua Zheng, Jianqiu Cai, Wangqiang Feng
Purpose: To investigate the ocular parameters of premature infants without ROP at gestational age (GA) more than 28 weeks and their relationship with growth parameters. Methods: 76 preterm infants without ROP and 65 term infants were involved to undergo portable slit lamp, RetCam3, ultrasonic A-scan biometry, and cycloplegic streak examination at their 40 weeks' postconceptional ages (PCA). Ocular parameters of infants' right eye and growth parameters were used for analysis...
2017: Journal of Ophthalmology
https://www.readbyqxmd.com/read/29151682/anterior-segment-morphology-in-primary-angle-closure-glaucoma-using-ultrasound-biomicroscopy
#7
Tarannum Mansoori, Nagalla Balakrishna
Aim: To evaluate the configuration of the anterior chamber angle quantitatively and study the morphological changes in the eye with ultrasound biomicroscopy (UBM) in primary angle closure glaucoma (PACG) patients after laser peripheral iridotomy (LPI). Materials and methods: A total of 185 eyes of 185 PACG patients post-LPI and 126 eyes of 126 normal subjects were included in this prospective study. All subjects underwent complete ophthalmic evaluation, A-scan biometry, and UBM...
September 2017: Journal of Current Glaucoma Practice
https://www.readbyqxmd.com/read/29131913/unilateral-congenital-cataract-clinical-profile-and-presentation
#8
Sudarshan Khokhar, Cijin P Jose, Ramanjit Sihota, Neha Midha
PURPOSE: To study the clinical profile and presentation of children with unilateral cataract. METHODS: In this hospital-based, observational, cross-sectional study, patients 15 years of age or younger who presented with unilateral cataract were recruited. Cases of cataract secondary to causes such as trauma or uveitis were excluded. Age at detection and presentation, distance from the treatment center, presenting complaints, cataract morphology, and biometry were noted for each case...
November 11, 2017: Journal of Pediatric Ophthalmology and Strabismus
https://www.readbyqxmd.com/read/29108394/comparative-study-of-3-exophthalmometers-and-computed-tomographic-biometry
#9
Juliette Delmas, Jean-Marie Loustau, Sylvain Martin, Loïc Bourmault, Jean-Paul Adenis, Pierre-Yves Robert
PURPOSE: Accurate and reproducible exophthalmometry is mandatory to diagnose and follow-up orbital patients, especially in Graves disease. However, many variations are described among the different commercially available exophthalmometers. METHODS: Sixty patients, who underwent a cerebral computed tomography (CT) scan, were included. External prebicanthal segments (EPBCS) for right and left eyes (RE and LE), interorbital distance, and globe axial length were recorded by a first observer (O1), more experienced than a second (O2)...
November 2, 2017: European Journal of Ophthalmology
https://www.readbyqxmd.com/read/29067532/biometric-evaluation-of-myopic-eyes-without-posterior-staphyloma-disproportionate-ocular-growth
#10
Sudarshan Khokhar, Brijesh Takkar, Esha Agarwal, Nripen Gaur, Raghav Ravani, Pradeep Venkatesh
PURPOSE: To evaluate changes in the anterior segment of myopic eyes and assess anterior biometry as a function of axial length (AL). DESIGN: Retrospective investigational study. PARTICIPANTS: Patients evaluated for phakic intraocular lens surgery at a tertiary eye care centre. METHODS: Patients with corrected visual acuity > 20/40 and AL > 24.5 mm were included in the study. Posterior staphyloma and maculopathy were ruled out in all the patients, and 176 eyes were included for analysis...
October 24, 2017: International Ophthalmology
https://www.readbyqxmd.com/read/28991611/effect-of-fixation-stability-during-biometry-measurements-on-refractive-prediction-accuracy-in-highly-myopic-eyes
#11
Xiangjia Zhu, Wenwen He, Yu Du, Yi Lu
PURPOSE: To assess the effect of preoperative biometry fixation stability on postoperative refractive errors in highly myopic cataractous eyes. SETTING: Eye and ENT Hospital of Fudan University, Shanghai, China. DESIGN: Prospective cohort study. METHODS: Eyes of highly myopic patients and emmetropic controls were included. Routine ophthalmologic examinations and measurement of fixation stability in the 63% and 95% bivariate contour ellipse areas (BCEAs) were conducted preoperatively...
September 2017: Journal of Cataract and Refractive Surgery
https://www.readbyqxmd.com/read/28990827/ural-eye-and-medical-study-description-of-study-design-and-methodology
#12
Mukharram Bikbov, Rinat R Fayzrakhmanov, Gyulli Kazakbaeva, Jost B Jonas
PURPOSE: Since there is a scarcity on population-based health information available for Russia, we conducted this project to assess the prevalence of major ocular and systemic disorders and their associated risk factors. METHODS: A population-based cross-sectional study (Ural Eye and Medical Study (UEMS)) was performed in Bashkortostan 1300 km east of Moscow. The sampling frame consisted of all inhabitants aged over 40 years and living in an urban study area in the capital city Ufa and a rural region at 65 km outside of Ufa...
October 9, 2017: Ophthalmic Epidemiology
https://www.readbyqxmd.com/read/28971252/morphometric-assessment-of-normal-human-ciliary-body-using-ultrasound-biomicroscopy
#13
Yoshifumi Okamoto, Fumiki Okamoto, Shinichiro Nakano, Tetsuro Oshika
PURPOSE: To quantitatively assess the biometry of the ciliary body in normal human eyes using ultrasound biomicroscopy. METHODS: We evaluated 85 eyes of 85 normal subjects (35 men and 50 women), whose age ranged from 11 to 86 years (mean ± SD, 56.8 ± 20.4 years). The eyes were assessed along the 3-, 6-, 9-, and 12-o'clock meridians relative to the center of the cornea. Clinical data were collected, including age, axial length, ciliary body length (CBL), ciliary body thickness (CBT), anterior chamber depth, iris root thickness, trabecular-iris angle, and scleral-ciliary process angle...
October 3, 2017: Graefe's Archive for Clinical and Experimental 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/28933972/visual-acuity-and-macular-and-peripapillary-thickness-in-high-myopia
#16
Solmaz Abdolrahimzadeh, Francesco Parisi, Andrea Maria Plateroti, Federica Evangelista, Vito Fenicia, Gianluca Scuderi, Santi Maria Recupero
PURPOSE: To investigate best corrected visual acuity (BCVA), and choroidal and retinal thickness values between high myopes without myopic maculopathy and emmetropes. MATERIALS AND METHODS: Case control study where 53 myopes with axial length (AL) above 26 mm without myopic maculopathy and 53 age-matched emmetropes with AL between 21.50 and 24.50 were included as controls. Complete ophthalmological examination and biometry were performed. Choroidal and individual retinal layer thickness maps using spectral domain optical coherence tomography were obtained in the macular and peripapillary area with enhanced depth imaging...
November 2017: Current Eye Research
https://www.readbyqxmd.com/read/28917399/variability-in-angle-%C3%AE%C2%BA-and-its-influence-on%C3%A2-higher-order-aberrations-in%C3%A2-pseudophakic-eyes
#17
Annette Harrer, Nino Hirnschall, Juan Tabernero, Pablo Artal, Petra Draschl, Sophie Maedel, Oliver Findl
PURPOSE: To observe the variability in angle κ in pseudophakic patients and assess its correlation with optical biometry measurements and higher-order aberrations (HOAs). SETTING: Hanusch Hospital, Vienna, Austria. DESIGN: Prospective case series. METHODS: This study included patients who had cataract surgery 3 months to 1 year before study recruitment. In all cases, Purkinje meter images were taken. In addition, partial coherence interferometry measurement (IOLMaster) of the axial intraocular lens (IOL) position was performed...
August 2017: Journal of Cataract and Refractive Surgery
https://www.readbyqxmd.com/read/28905827/refractive-and-ocular-biometric-profile-of-children-with-a-history-of-laser-treatment-for-retinopathy-of-prematurity
#18
Savleen Kaur, Jaspreet Sukhija, Deeksha Katoch, Mansi Sharma, Ramanuj Samanta, Mangat R Dogra
PURPOSE: Indian children belong to a diverse socioeconomic strata with retinopathy of prematurity (ROP) developing in mature, higher birth weight babies as well. The purpose of our study is to analyze the long-term status of refractive errors and its relationship with ocular biometry in children with ROP who were laser treated at a tertiary center in North India. METHODS: Cross sectional study. Children (<16 years) enrolled from January 2014 to December 2014 with a history of laser treatment for ROP and examined for refractive and biometric status...
September 2017: Indian Journal of Ophthalmology
https://www.readbyqxmd.com/read/28900109/region-specific-differential-corneal-and-scleral-mrna-expressions-of-mmp2-timp2-and-tgfb2-in-highly-myopic-astigmatic-chicks
#19
Lisa Yan-Yan Xi, Shea Ping Yip, Sze Wan Shan, Jody Summers-Rada, Chea-Su Kee
Myopia and astigmatism, two common refractive errors frequently co-exist, are affecting vision at all working distances in the affected populations worldwide. Eyeballs having these refractive errors are known to exhibit abnormal eye shape at the anterior and posterior eye segments, but whether the outer coats of these abnormal eyeballs, cornea anteriorly and sclera posteriorly, are regulated by region-specific molecular mechanism remains unclear. Here we presented the changes in mRNA expression levels of three genes (MMP2, TIMP2, and TGFB2), all known to participate in extracellular matrix organization, at five regions of the cornea and sclera in chickens developing high myopia and astigmatism induced by form deprivation...
September 12, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28891727/methodology-of-the-zoc-bhvi-high-myopia-cohort-study-the-onset-and-progression-of-myopic-pathologies-and-associated-risk-factors-in-highly-myopic-chinese
#20
Yanxian Chen, Ou Xiao, Xinxing Guo, Decai Wang, Padmaja Sankaridurg, Ian Morgan, Mingguang He
PURPOSE: The increasing prevalence of high myopia and its associated pathologies has raised challenges to ophthalmic services. This project aims to explore the onset and progression of myopic pathologies in highly myopic eyes through a prospective research cohort established in South China. METHODS: Patients with high myopia (sphere ≤ -6.00 D) visiting the optometric clinic of Zhongshan Ophthalmic Center (ZOC) were invited to participate in the baseline examinations and follow-up visit over a 10-year period...
September 11, 2017: Ophthalmic Epidemiology
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