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Eye biometry

Jameel Rizwana Hussaindeen, Mithra Anand, Viswanathan Sivaraman, Krishna Kumar Ramani, Peter M Allen
Purpose: Variant myopia (VM) presents as a discrepancy of >1 diopter (D) between subjective and objective refraction, without the presence of any accommodative dysfunction. The purpose of this study is to create a clinical profile of VM. Methods: Fourteen eyes of 12 VM patients who had a discrepancy of >1D between retinoscopy and subjective acceptance under both cycloplegic and noncycloplegic conditions were included in the study. Fourteen eyes of 14 age- and refractive error-matched participants served as controls...
June 2018: Indian Journal of Ophthalmology
Esther M Hoffmann, Irene Schmidtmann, Angeliki Siouli, Alexander K Schuster, Manfred E Beutel, Norbert Pfeiffer, Julia Lamparter
PURPOSE: To evaluate the distribution of peripapillary retinal nerve fiber layer thickness as measured by optical coherence tomography and its associations with ocular parameters in a population-based setting. METHODS: In the population-based Gutenberg Health Study, 1974 subjects from the Mainz-Bingen region were scheduled for ophthalmologic examinations, including visual acuity, refraction, tonometry, biometry, and measurements of peripapillary retinal nerve fiber layer thickness (pRNFL) by optical coherence tomography (SD-OCT, Spectralis®, Heidelberg Engineering, Germany)...
May 18, 2018: Graefe's Archive for Clinical and Experimental Ophthalmology
Ahnul Ha, Won Ryang Wee, Mee Kum Kim
PURPOSE: To evaluate the agreement in axial length (AL), keratometry, and anterior chamber depth measurements between AL-Scan and IOLMaster biometers and to compare the efficacy of the AL-Scan on intraocular lens (IOL) power calculations and refractive outcomes with those obtained by the IOLMaster. METHODS: Medical records of 48 eyes from 48 patients who underwent uneventful phacoemulsification and IOL insertion were retrospectively reviewed. One of the two types of monofocal aspheric IOLs were implanted (Tecnis ZCB00 [Tecnis, n = 34] or CT Asphina 509M [Asphina, n = 14])...
May 15, 2018: Korean Journal of Ophthalmology: KJO
Sagar B Patel, Nisha Reddy, Xihui Lin, Jess T Whitson
Purpose: To evaluate the relationship between axial length (AL) and retinal nerve fiber layer (RNFL) profile and to characterize differences in optical coherence tomography RNFL of myopic glaucomatous eyes compared to nonglaucomatous eyes. Methods: Retrospective chart review of 170 eyes of 89 subjects with optical biometry and optical coherence tomography RNFL assessment was conducted. Results: Temporal RNFL thickness showed no association with AL in either glaucomatous or nonglaucomatous eyes...
2018: Clinical Ophthalmology
Richard N McNeely, Salissou Moutari, Eric Pazo, Jonathan E Moore
Background: To investigate the impact of the orientation of preoperative corneal astigmatism on achieving the postoperative target refraction following monofocal intraocular lens (IOL) implantation. Methods: This study enrolled 339 eyes who had uneventful cataract surgery or refractive lens exchange (RLE) with subsequent monofocal IOL implantation. Eyes were initially categorized dependent upon axial length and then on the orientation of preoperative anterior corneal astigmatism...
2018: Eye and Vision (London, England)
Maria Muzyka-Woźniak, Adam Oleszko
PURPOSE: To compare measurements of axial length (AL), corneal curvature (K), anterior chamber depth (ACD) and white-to-white (WTW) distance on a new device combining Scheimpflug camera and partial coherence interferometry (Pentacam AXL) with a reference optical biometer (IOL Master 500). To evaluate differences between IOL power calculations based on the two biometers. METHODS: Ninety-seven eyes of 97 consecutive cataract or refractive lens exchange patients were examined preoperatively on IOL Master 500 and Pentacam AXL units...
April 26, 2018: International Ophthalmology
Joris Vander Mijnsbrugge, Jean-Francois Fils, Joyce Jansen, Minh-Tri Hua, Peter Stalmans
PURPOSE: To compare the effective lens position (ELP) after phaco surgery alone and after combined phacovitrectomy surgery. METHODS: Twenty patients who were scheduled for elective surgery in both eyes were included. In one eye, phacovitrectomy surgery was performed (without any tamponade), and in the fellow eye, only phaco surgery was performed using the same IOL type. Pre- and postoperative biometric measurements were performed using laser interference biometry...
April 26, 2018: Graefe's Archive for Clinical and Experimental Ophthalmology
Luoli Zhang, Xiangui He, Xiaomei Qu, Xiaofang You, Bingjie Wang, Huijing Shi, Hui Tan, Haidong Zou, Jianfeng Zhu
Purpose: To investigate the refraction and ocular biometry characteristics and to examine the prevalence of refractive errors in preschool children aged 3 to 6 years in Shanghai, China. Methods: A school-based cross-sectional study was conducted in Jiading and Xuhui District, Shanghai, in 2013. We randomly selected 7 kindergartens in Jiading District and 10 kindergartens in Xuhui District, with a probability proportionate to size. The children underwent comprehensive eye examinations, including cycloplegic refraction and biometric measurements...
2018: Journal of Ophthalmology
Beata P Sander, Michael J Collins, Scott A Read
PURPOSE: To analyse the short-term interaction between a short period of myopic and hyperopic defocus and the muscarinic antagonist homatropine upon the choroidal thickness and ocular biometrics of healthy subjects. METHODS: Thirty young adults (15 myopes and 15 emmetropes) aged 18-35 years had subfoveal choroidal thickness (ChT) and ocular biometry measurements taken before, 30 min, and 60 min following the introduction of monocular optical blur (0.00 D, +3...
May 2018: Ophthalmic & Physiological Optics: the Journal of the British College of Ophthalmic Opticians (Optometrists)
Mats Lundström, Mor Dickman, Ype Henry, Sonia Manning, Paul Rosen, Marie-José Tassignon, David Young, Ulf Stenevi
PURPOSE: To analyze risk factors for refractive error after cataract surgery and provide a benchmark for refractive outcomes after standard cataract surgery. SETTING: One hundred cataract surgery clinics from 12 European countries. DESIGN: Multicenter database study. METHODS: Data on consecutive cataract extractions reported to the European Registry of Quality Outcomes for Cataract and Refractive Surgery between January 1, 2014 and December 31, 2015 were analyzed in terms of demographics, preoperative corrected distance visual acuity (CDVA), target refraction, coexisting eye diseases, surgical difficulties including previous ophthalmic interventions, type of surgery, intraocular lens (IOL), and surgical complications...
April 20, 2018: Journal of Cataract and Refractive Surgery
Qing Huang, Yongzhi Huang, Qu Luo, Wei Fan
BACKGROUND: We aimed to measure ocular biometric characteristics in older cataract patients from western China. METHODS: Ocular biometry records were retrospectively analyzed for 6933 patients with cataracts (6933 eyes) at least 50 years old who were treated at West China Hospital of Sichuan University. RESULTS: Partial coherence laser interferometry gave the following population averages: axial length (AL), 24.32 ± 2.42 mm; anterior chamber depth (ACD), 3...
April 17, 2018: BMC Ophthalmology
Karol Taradaj, Tomasz Ginda, Piotr Ciechanowicz, Piotr Maciejewicz, Barbara Suchońska, Iwona Szymusik, Bożena Kociszewska-Najman, Mirosław Wielgoś, Dariusz Kęcik
The physiology of pregnancy is a curious issue for specialists from different branches of medicine and science. In this systematic review, the attention was focused on changes in eyes during pregnancy and confinement. To summarise and systematize actual knowledge in eyes' changes during pregnancy, publications from years 2011-2017 were analysed. Stud-ies about parameters of corneal endothelial cells, corneal biomechanical parameters, keratometric variables, intraocular pressure and biometry of the anterior chamber were compared...
2018: Ginekologia Polska
Alberto Domínguez-Vicent, Daniel Monsálvez-Romín, José J Esteve-Taboada, Robert Montés-Micó, Teresa Ferrer-Blasco
PURPOSE: To compare changes in the ciliary muscle area at different sectors between pre-presbyopic and presbyopic eyes during accommodation by means of an anterior segment optical coherence tomographer (OCT). METHODS: The anterior ciliary muscle area was measured in 20 healthy and phakic pre-presbyopic eyes, whose mean age was 23.3±4.4 years, and in 20 healthy and phakic presbyopic eyes, whose mean age was 46.5±5.2 years. The relative change in the cross-sectional area of the ciliary muscle was measured at the nasal, inferior, and temporal sectors between 0 and -3 D of vergence, in -1 D step...
April 4, 2018: Journal of Optometry
Yin Guo, Li Juan Liu, Ping Tang, Yi Feng, Yan Yun Lv, Min Wu, Liang Xu, Jost B Jonas
Purpose: To assess the development and enlargement of the parapapillary gamma zone in school children. Methods: This school-based prospective longitudinal study included Chinese children attending grade 1 in 2011 and returning for yearly follow-up examinations until 2016. These examinations consisted of a comprehensive ocular examination with biometry and color fundus photographs. The parents underwent a standardized interview. The parapapillary gamma zone was defined as the area with visible sclera at the temporal optic disc margin, and the optic disc itself was measured on fundus photographs...
March 1, 2018: Investigative Ophthalmology & Visual Science
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
Tiago Monteiro, Andreia Soares, Ricardo Dourado Leite, Nuno Franqueira, Fernando Faria-Correia, Fernando Vaz
Purpose: To evaluate and compare the changes in refraction and effective intraocular lens (IOL) position between a plate-haptic IOL and a c-loop single-piece IOL after neodymium-doped yttrium aluminium garnet (YAG) laser posterior capsulotomy. Methods: In a prospective study, anterior chamber depth and subjective refraction were measured in 110 pseudophakic eyes from 110 patients, before and 1 month after YAG laser capsulotomy. Patients were divided into 2 groups according to the IOL design: group 1 (plate-haptic acrylic hydrophilic AT LISA tri 839MP® ) and group 2 (c-loop acrylic hydrophobic single-piece AcrySof® SA60AT)...
2018: Clinical Ophthalmology
K B Nonon Saa
In order to fight against blindness in the central region of Togo, a project was implemented in a partnership between the Ministry of Health and an international Non-Governmental Organization: the Swiss Red Cross. Cataract surgery underwent an annual audit of the research-action type, in order to improve the functional results of patients. One of the recommendations of these audits was the introduction of manual small incision surgery in place of the classic extracapsular technique. This study had for its objective to evaluate the functional results and follow-up of patients undergoing the new technique compared with quality standards of cataract surgery according to the World Health Organization...
March 24, 2018: Journal Français D'ophtalmologie
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
Nilanjana Deb-Joardar, Kasu Prasad Reddy
Purpose: The aim of this study is to assess the efficacy of ultrasound cycloplasty (UCP) in Indian patients with open angle glaucoma (OAG). Methods: A prospective interventional study was designed to treat 73 eyes of 73 patients with OAG with the EyeOP1 device equipped with six miniaturized cylindrical piezoelectric transducers. Two treatment protocols of ultrasound delivery depending on exposure time (8 s and 10 s of shot per transducer) were used. Complete ophthalmic examination, ocular biometry and anterior segment optical coherence tomography were performed preoperatively and patients were followed up at day 1, day 7 and months 1, 2, 3, 6, and 12...
April 2018: Indian Journal of Ophthalmology
Jorge A Calvo-Sanz, Javier Ruiz-Alcocer, Miguel A Sánchez-Tena
PURPOSE: To compare and analyze the accuracy of the refractive outcomes obtained in intraocular lens power calculation using the classical calculation method with mean keratometry (K) and the calculation method with both K meridians presented in this article. METHODS: A total of 62 eyes of 62 subjects who were undergoing cataract surgery were included in this study. Optical biometry was performed using mean K and Haigis formula for classical intraocular lens calculation methods to achieve intraocular lens power; 4 weeks after surgery, prior to medical discharge, subjective refraction was made...
March 1, 2018: European Journal of Ophthalmology
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