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Eye biometry

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https://www.readbyqxmd.com/read/29163989/axial-length-and-ocular-development-of-premature-infants-without-rop
#1
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
#2
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
#3
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/29131702/postoperative-refractive-errors-following-pediatric-cataract-extraction-with-intraocular-lens-implantation
#4
Maanasa Indaram, Deborah K VanderVeen
PURPOSE: Advances in surgical techniques allow implantation of intraocular lenses (IOL) with cataract extraction, even in young children. However, there are several challenges unique to the pediatric population that result in greater degrees of postoperative refractive error compared to adults. METHODS: Literature review of the techniques and outcomes of pediatric cataract surgery with IOL implantation. RESULTS: Pediatric cataract surgery is associated with several sources of postoperative refractive error...
November 13, 2017: Seminars in Ophthalmology
https://www.readbyqxmd.com/read/29108394/comparative-study-of-3-exophthalmometers-and-computed-tomographic-biometry
#5
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/29090047/accuracy-of-various-intraocular-lens-power-calculation-formulas-in-steep-corneas
#6
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/29067532/biometric-evaluation-of-myopic-eyes-without-posterior-staphyloma-disproportionate-ocular-growth
#7
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/29060813/eeg-based-biometry-using-steady-state-visual-evoked-potentials
#8
Owen Falzon, Rosanne Zerafa, Tracey Camilleri, Kenneth P Camilleri
The use of brain signals for person recognition has in recent years attracted considerable interest because of the increased security and privacy these can offer when compared to conventional biometric measures. The main challenge lies in extracting features from the EEG signals that are sufficiently distinct across individuals while also being sufficiently consistent across multiple recording sessions. A range of EEG phenomena including eyes open and eyes closed activity, visual evoked potentials (VEPs) through image presentation, and other mental tasks have been studied for their use in biometry...
July 2017: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28991611/effect-of-fixation-stability-during-biometry-measurements-on-refractive-prediction-accuracy-in-highly-myopic-eyes
#9
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
#10
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/28974839/phacoemulsification-after-penetrating-keratoplasty-due-war-injury-at-young-adult
#11
Emir Cabric, Vahid Jusufovic, Nizama Salihefendic, Amra Nadarevic Vodencarevic
INTRODUCTION: It is known that phacoemulsification of cataracts after penetrating keratoplasty there are always some difficulties and of course a higher rate of different intraoperative complications. Phacoemulsification after PK may cause significant endothelial injury and affect long term graft survival. AIM: The aim of this report is to describe one of these cases and the possible ways to manage them. CASE REPORT: We report a case o of a 31-year-old female patient, with a cataract on her left eye...
June 2017: Medical Archives
https://www.readbyqxmd.com/read/28971252/morphometric-assessment-of-normal-human-ciliary-body-using-ultrasound-biomicroscopy
#12
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/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/28932335/cataract-surgery-in-patients-with-keratoconus-pearls-and-pitfalls
#16
F Aiello, Q J Nasser, C Nucci, R I Angunawela, Z Gatzioufas, V Maurino
BACKGROUND: Keratoconus (KC) is a common ectatic disorder resulting in progressive corneal thinning and irregular astigmatism. It has been observed that patients affected by KC are more likely to develop lens opacities earlier compared to non-keratoconic patients. OBJECTIVE: Intraocular lens (IOL) selection and refractive outcome prediction are among a number of factors that can make cataract surgery in keratoconic patients challenging. Accurate biometry is often difficult to obtain due to unreliable K measurements and lack of dedicated biometric formulae...
2017: Open Ophthalmology Journal
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/28905823/refractive-outcomes-of-intraoperative-wavefront-aberrometry-versus-optical-biometry-alone-for-intraocular-lens-power-calculation
#18
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/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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