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Eye biometry

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https://www.readbyqxmd.com/read/27900479/evaluation-of-the-repeatability-of-a-swept-source-ocular-biometer-for-measuring-ocular-biometric-parameters
#1
Teresa Ferrer-Blasco, Alberto Domínguez-Vicent, José J Esteve-Taboada, Miguel A Aloy, Jose E Adsuara, Robert Montés-Micó
PURPOSE: The purpose was to evaluate the repeatability of a new swept-source optical biometer for measuring ocular biometric parameters. METHODS: Thirty subjects with healthy and phakic eyes were included in this study, and only one eye per participant was analysed. Each eye was measured five times with the IOLMaster 700 swept-source optical biometer (Carl Zeiss Meditec, Jena, Germany). Axial length (AL), anterior chamber depth (ACD), central corneal thickness (CCT), lens thickness (LT), white-to-white (WTW), and K1 and K2 keratometric readings were evaluated...
November 30, 2016: Graefe's Archive for Clinical and Experimental Ophthalmology
https://www.readbyqxmd.com/read/27898517/comparision-of-optical-low-coherence-reflectometry-versus-ultrasonic-biometry-in-high-hypermetropia
#2
Rukiye Aydin, Sevil Karaman Erdur, Kubra Serefoglu Cabuk, Eyyup Karahan, Suleyman Kaynak
PURPOSE: To compare anterior chamber depth (ACD), axial length (AL), and lens thickness (LT) measurements obtained by the Lenstar LS 900 (Haag-Streit AG) optical low-coherence reflectometry with those obtained by the A-scan contact ultrasound among patients with moderate and high hypermetropia. METHODS: Fifty-two eyes of 52 patients with moderate and high hypermetropia (spherical equivalent of +4 D or more) were examined in this study measurements of ACD, AL, and LT obtained by Lenstar were compared with those obtained by applanation A-scan ultrasound...
November 24, 2016: Eye & Contact Lens
https://www.readbyqxmd.com/read/27863894/precise-measurement-of-scleral-radius-using-anterior-eye-profilometry
#3
Danilo A Jesus, Renata Kedzia, D Robert Iskander
PURPOSE: To develop a new and precise methodology to measure the scleral radius based on anterior eye surface. METHODS: Eye Surface Profiler (ESP, Eaglet-Eye, Netherlands) was used to acquire the anterior eye surface of 23 emmetropic subjects aged 28.1±6.6years (mean±standard deviation) ranging from 20 to 45. Scleral radius was obtained based on the approximation of the topographical scleral data to a sphere using least squares fitting and considering the axial length as a reference point...
November 15, 2016: Contact Lens & Anterior Eye: the Journal of the British Contact Lens Association
https://www.readbyqxmd.com/read/27862797/ocular-biometry-by-computed-tomography-in-different-dog-breeds
#4
Carolin L H Chiwitt, Stephen J Baines, Paul Mahoney, Andrew Tanner, Christine L Heinrich, Michael Rhodes, Heidi J Featherstone
OBJECTIVE: To (i) correlate B-mode ocular ultrasound (US) and computed tomography (CT) (prospective pilot study), (ii) establish a reliable method to measure the normal canine eye using CT, (iii) establish a reference guide for some dog breeds, (iv) compare eye size between different breeds and breed groups, and (v) investigate the correlation between eye dimensions and body weight, gender, and skull type (retrospective study). PROCEDURE: B-mode US and CT were performed on ten sheep cadaveric eyes...
November 11, 2016: Veterinary Ophthalmology
https://www.readbyqxmd.com/read/27843285/clinical-outcomes-with-toric-intraocular-lenses-planned-using-an-optical-low-coherence-reflectometry-ocular-biometer-with-a-new-toric-calculator
#5
Kjell G Gundersen, Richard Potvin
PURPOSE: To prospectively evaluate postoperative clinical outcomes with implantation of toric intraocular lenses (IOLs) using preoperative keratometry from an optical low coherence reflectometry (OLCR) ocular biometer (Lenstar(®) LS900) and the built-in Barrett toric calculator. PATIENTS AND METHODS: A prospective observational study recruited one or both eyes of subjects who underwent uncomplicated cataract surgery with toric IOL implantation using OLCR biometery data and the Barrett toric IOL calculator for toric IOL planning...
2016: Clinical Ophthalmology
https://www.readbyqxmd.com/read/27833928/comparison-of-a-new-optical-biometer-and-a-standard-biometer-in-cataract-patients
#6
Pipat Kongsap
BACKGROUND: Cataract surgery is the most common surgical procedure in ophthalmology. Biometry data and accurate intraocular lens (IOL) calculations are very important in achieving the desired refractive outcomes. The aim of this study was to compare measurements using a new optical low coherence reflectometry (OLCR) biometer (OA-2000) and the gold standard partial coherence interferometry (PCI) optical biometer (IOLMaster 500). METHODS: Ocular biometry of cataract patients were measured by the OA-2000 and IOLMaster 500 to compare keratometry (K), axial length (AL), anterior chamber depth (ACD), white-to-white (WTW) diameter, and IOL power using the SRK/T formula...
2016: Eye and Vision (London, England)
https://www.readbyqxmd.com/read/27830199/qualitative-evaluation-of-anterior-segment-in-angle-closure-disease-using-anterior-segment-optical-coherence-tomography
#7
Sasan Moghimi, Rebecca Chen, Nikoo Hamzeh, Nassim Khatibi, Shan C Lin
PURPOSE: To evaluate different mechanisms of primary angle closure (PAC) and to quantify anterior chamber (AC) parameters in different subtypes of angle closure disease using anterior segment optical coherence tomography (AS-OCT). METHODS: In this prospective study, 115 eyes of 115 patients with angle closure disease were included and categorized into three groups: 1) fellow eyes of acute angle closure (AAC; 40 eyes); 2) primary angle closure glaucoma (PACG; 39 eyes); and 3) primary angle closure suspect (PACS; 36 eyes)...
December 2016: Journal of Current Ophthalmology
https://www.readbyqxmd.com/read/27811575/comparison-of-anterior-chamber-parameters-in-patients-with-plateau-iris-configuration-and-pupillary-block-using-asoct
#8
Sasan Moghimi, Mohammadyaser Kiaroudi, Paul Coh, Yingjie Li, Mingguang He, Shan C Lin
PURPOSE: To quantitatively analyze the anterior chamber parameters in patients with pupillary block (PB) and plateau iris configuration (PIC) using anterior segment optical coherence tomography (ASOCT). PATIENTS AND METHODS: In this cross-sectional study, nonglaucomatous subjects consecutively recruited and a total of 212 eyes divided into 3 groups of PIC (31 eyes), PB (60 eyes), and open angles (121 eyes) based on gonioscopic and ultrasound biomicroscopy findings...
November 2, 2016: Journal of Glaucoma
https://www.readbyqxmd.com/read/27800269/early-postoperative-effects-of-cataract-surgery-on-anterior-segment-parameters-in-primary-open-angle-glaucoma-and-pseudoexfoliation-glaucoma
#9
Ufuk Elgin, Emine Şen, Tülay Şimşek, Kemal Tekin, Pelin Yılmazbaş
OBJECTIVES: To compare the effect of cataract surgery on anterior segment parameters measured by optical biometry in primary open-angle glaucoma (POAG) and pseudoexfoliation glaucoma (PXG). MATERIALS AND METHODS: Twenty-five eyes of 25 patients with POAG and 29 eyes of 29 patients with PXG who had uncomplicated phacoemulsification and posterior chamber intraocular lens implantation surgery were included to our prospective study. Central corneal thickness (CCT), anterior chamber depth (ACD) and axial length (AL) were measured with an optical biometer preoperatively and at 1 month postoperatively...
June 2016: Turkish Journal of Ophthalmology
https://www.readbyqxmd.com/read/27770479/hidden-mechanisms-beyond-the-pupillary-block-in-acute-angle-closure-ultrasound-biomicroscopic-study
#10
Yanin Suwan, Sunpong Jiamsawad, Wasu Supakontanasan, Chaiwat Teekhasaenee
BACKGROUND: To evaluate the mechanisms of acute angle-closure (AAC) other than the pupillary block using ultrasound biomicroscopy DESIGN: Retrospective chart review. PARTICIPANTS: All patients who were diagnosed with AAC in Ramathibodi Hospital, Bangkok, Thailand, between June 2011 and February 2015 were enrolled. METHODS: 72 patients who were diagnosed with AAC underwent a detailed ocular examination. The diagnosed mechanism of AAC was confirmed by UBM and ocular biometry...
October 22, 2016: Clinical & Experimental Ophthalmology
https://www.readbyqxmd.com/read/27770390/repeatability-of-ocular-biometry-with-iolmaster-700-in-subjects-with-clear-lens
#11
Manuel Garza-Leon, Hugo A Fuentes-de la Fuente, Ana V García-Treviño
PURPOSE: The purpose of the study was to assess the reproducibility of ocular biometry using the IOLMaster-700 in a healthy population. METHODS: This is a prospective, cross-sectional, observational reproducibility study. Ocular biometry was performed three times on each of 45 studied eyes. Flattest meridian (Kf) and the steepest meridian (Ks), central corneal thickness, axial length, anterior chamber depth, aqueous depth, lens thickness, and white-to-white distances were recorded...
October 21, 2016: International Ophthalmology
https://www.readbyqxmd.com/read/27764227/association-between-myopia-biometry-and-occludable-angle-the-jiangning-eye-study
#12
Xiaohong Liu, Hehua Ye, Qi Zhang, Xuan Cai, Wenjing Yu, Siyi Yu, Tianyu Wang, Wuyi Lu, Xiang Li, Peiquan Zhao
BACKGROUND: Myopia subjects usually have long axial lengths and are predisposed to deep anterior chamber depths and open angles. Jiangning eye study is a randomized, population based study in Shanghai to determine whether myopia has an effect on the prevalence of occludable angles. METHODS: A total of 2478 residents aged 50 years and over were randomly selected, and 2044 (82.5%) individuals of them participated in ophthalmic examinations between November 2012 and February 2013...
2016: PloS One
https://www.readbyqxmd.com/read/27741085/predictability-of-biometry-in-patients-undergoing-cataract-surgery
#13
Nir Sorkin, Amir Rosenblatt, Irina S Barequet
PURPOSE: To compare measurements of axial length (AL), anterior chamber depth (ACD), keratometry (K), and the refractive predictability of the Aladdin and IOLMaster biometry devices in cataract surgery patients. METHODS: A retrospective observational study of eyes undergoing cataract surgery. Data were retrieved on AL, ACD, and K measurements obtained by the Aladdin and the IOLMaster. Furthermore, the postoperative refractive prediction errors were compared between the devices...
December 2016: Optometry and Vision Science: Official Publication of the American Academy of Optometry
https://www.readbyqxmd.com/read/27737460/the-role-of-retinal-dopamine-in-c57bl-6-mouse-refractive-development-as-revealed-by-intravitreal-administration-of-6-hydroxydopamine
#14
Xiao-Hua Wu, Kang-Wei Qian, Guo-Zhong Xu, Yun-Yun Li, Yuan-Yuan Ma, Furong Huang, Yan-Qing Wang, Xiangtian Zhou, Jia Qu, Xiong-Li Yang, Yong-Mei Zhong, Shi-Jun Weng
Purpose: Although retinal dopamine (DA) has been long implicated in myopia development, current studies demonstrate that retinal DA levels are unaltered in C57BL/6 mice with form-deprivation myopia. This work was undertaken to explore whether and how refractive development is perturbed in this mouse strain when retinal DA levels are reduced by 6-hydroxydopamine (6-OHDA) administration. Methods: On two successive days, 6-OHDA was injected into the vitreous of P18 mice...
October 1, 2016: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/27729753/influence-of-myopia-on-size-of-optic-nerve-head-and-retinal-nerve-fiber-layer-thickness-measured-by-spectral-domain-optical-coherence-tomography
#15
Seok Hyun Bae, Shin Hee Kang, Chi Shian Feng, Joohyun Park, Jae Hoon Jeong, Kayoung Yi
PURPOSE: To investigate optic nerve head size and retinal nerve fiber layer (RNFL) thickness according to refractive status and axial length. METHODS: In a cross-sectional study, 252 eyes of 252 healthy volunteers underwent ocular biometry measurement as well as optic nerve head and RNFL imaging by spectral-domain optical coherence tomography. Correlation and linear regression analyses were performed for all subjects. The magnification effect was adjusted by the modified axial length method...
October 2016: Korean Journal of Ophthalmology: KJO
https://www.readbyqxmd.com/read/27722757/comparison-of-al-scan-and-iolmaster-500-partial-coherence-interferometry-optical-biometers
#16
Kenneth J Hoffer, Giacomo Savini
PURPOSE: To investigate agreement between the ocular biometry measurements provided by a newer optical biometer, the AL-Scan (Nidek Co, Ltd., Gamagori, Japan) and those provided by the IOLMaster 500 (Carl Zeiss Meditec, Jena Germany), which are both based on partial coherence interferometry. METHODS: Axial length, corneal power, and anterior chamber depth (corneal epithelium to lens) were measured in 86 eyes of 86 patients scheduled for cataract surgery using both biometers...
October 1, 2016: Journal of Refractive Surgery
https://www.readbyqxmd.com/read/27702623/changes-in-ocular-parameters-and-intraocular-lens-powers-in-aging-cycloplegic-eyes
#17
Pelin Özyol, Erhan Özyol, Ercan Baldemir
PURPOSE: Age-related changes in lens elasticity and ciliary muscle contractility can affect how ocular parameters respond to cycloplegia, and therefore intraocular lens (IOL) power measurements calculated by formulas using anterior chamber depth (ACD), lens thickness (LT), or white-to-white (WtW) for effective lens position prediction can vary. In response, using swept-source optical biometry in prepresbyopic and presbyopic eyes, we investigated changes in ocular parameters and IOL power calculations attributable to cycloplegia...
January 2017: American Journal of Ophthalmology
https://www.readbyqxmd.com/read/27661991/refractive-outcome-of-cataract-surgery-in-eyes-with-prior-trabeculectomy-risk-factors-for-postoperative-myopia
#18
Oliver L Yeh, Karine D Bojikian, Mark A Slabaugh, Philip P Chen
PURPOSE: To examine refractive outcomes after phacoemulsification in eyes with prior trabeculectomy. DESIGN: Retrospective observational case-control study METHODS:: Comparison of eyes of glaucoma patients undergoing cataract surgery after trabeculectomy (study group) with a matched group with medically controlled glaucoma (control group). Laser interferometry was used to obtain ocular biometry. We measured the difference between the expected and actual postoperative refraction using third-generation and fourth-generation intraocular lens (IOL) prediction formulae (Haigis, Holladay 2, Hoffer Q, and SRK-T)...
September 21, 2016: Journal of Glaucoma
https://www.readbyqxmd.com/read/27624171/comparison-of-ultrasound-biomicroscopy-and-ultrasonographic-parameters-in-eyes-with-phacomorphic-glaucoma-and-eyes-with-mature-cataract
#19
Sujata Subbiah, Philip A Thomas, C A Nelson Jesudasan
PURPOSE: To compare data on anatomical and biometric parameters, and their combination, obtained by using ultrasound biomicroscopy (UBM) and A-scan in eyes with phacomorphic glaucoma (PG) and eyes with mature cataract and to determine differences that may predispose to development of PG. METHODS: Eighty patients (80 eyes) were enrolled in this cross-sectional study. Anterior chamber parameters, namely anterior chamber depth (ACD), angle-opening distance (AOD), iris-lens contact distance (ILCD), and trabecular-ciliary process distance (TCPD), among other parameters, were assessed by UBM (35 MHz), while axial length (AL) and lenticular thickness (LT) were determined by A-scan biometry...
September 13, 2016: International Ophthalmology
https://www.readbyqxmd.com/read/27605833/investigation-of-parasites-of-pikes-esox-lucius-linnaeus-1785-from-chamkhale-river-anzali-and-amirkelayeh-wetlands-iran
#20
Ali Sadrinejad, Hossein Khara, Majid Gudarzi
To investigate the health status, the parasite diversity and abundance were studied in three pike populations. For this purpose, totally 90 fish were caught from three natural habitats of pike including Chamkhale River, Anzali and Amirkelayeh wetlands, Iran. After biometry and age determination, fish were dissected and parasites were investigated in intestine, gill and eye. According to results, five parasite species were identified in whole body of pikes including Eustrongylides exises, Raphidascaris acus and Triaeophorus crassus in intestine, Tetraonchus monenteron in gill and Diplostomum spathaceum in eye...
September 2016: Journal of Parasitic Diseases: Official Organ of the Indian Society for Parasitology
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