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Refractive error

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https://www.readbyqxmd.com/read/28823075/refractive-corneal-and-ocular-residual-astigmatism-distribution-in-a-german-population-and-age-dependency-the-gutenberg-health-study
#1
Alexander Karl-Georg Schuster, Norbert Pfeiffer, Andreas Schulz, René Hoehn, Katharina A Ponto, Philipp S Wild, Maria Blettner, Manfred E Beutel, Karl J Lackner, Thomas Münzel, Alireza Mirshahi
PURPOSE: Worldwide, the most frequent cause of visual impairment is uncorrected refractive error. This analysis focused on the distribution and associations of refractive, corneal and ocular residual astigmatism. METHODS: As part of the Gutenberg Health study, a population-based cross-sectional study was conducted in the general population of Germany. A comprehensive ophthalmological examination including refraction, tonometry, and Scheimpflug imaging of the anterior cornea (Pachycam) was performed...
August 19, 2017: Graefe's Archive for Clinical and Experimental Ophthalmology
https://www.readbyqxmd.com/read/28822026/corneal-thickness-residual-stromal-thickness-and-its-effect-on-opaque-bubble-layer-in-small-incision-lenticule-extraction
#2
Jiaonan Ma, Yan Wang, Liuyang Li, Jiamei Zhang
PURPOSE: To evaluate the effects of the central corneal thickness (CCT) and residual stromal thickness (RST) on the formation of opaque bubble layer (OBL) during small-incision lenticule extraction (SMILE). METHODS: A total of 345 eyes from Refractive Surgery Center database at Tianjin Eye Hospital that had been subjected to SMILE surgery and followed for 6 months were included in this study and divided into OBL and OBL-free groups. Preoperative, intraoperative, and postoperative data for all eyes were evaluated and analyzed using multivariate regression analysis...
August 18, 2017: International Ophthalmology
https://www.readbyqxmd.com/read/28817733/changing-patterns-of-cataract-services-in-north-west-nigeria-2005-2016
#3
Nasiru Muhammad, Mohammed Dantani Adamu, Mpyet Caleb, Nuhu Mohammed Maishanu, Aliyu Mohammed Jabo, Muhammad Mansur Rabiu, Covadonga Bascaran, Sunday Isiyaku, Allen Foster
PURPOSE: This study was conducted to assess the impact of the eye care programme on cataract blindness and cataract surgical services in Sokoto, Nigeria over a 12 year period 2005-2016. METHODS: Data from the 2005 population based cross-sectional study of blindness in Sokoto state was re-analysed to obtain baseline estimates of the prevalence of cataract blindness and cataract surgical coverage for persons 50 years and over in Wurno health zone. A population based survey of a representative sample of persons 50 years and over in Wurno health zone was conducted in July 2016...
2017: PloS One
https://www.readbyqxmd.com/read/28816868/comparison-of-refractive-measures-of-three-autorefractors-in-children-and-adolescents
#4
Shuyu Xiong, Minzhi Lv, Haidong Zou, Jianfeng Zhu, Lina Lu, Bo Zhang, Junjie Deng, Chunxia Yao, Xiangui He, Xun Xu
SIGNIFICANCE: Our study found a good agreement between three autorefractors. Not only will readers benefit as they can now compare data measured with either device in different studies but the three devices can be used in the same study to generate one pool of data, which can be analyzed together. PURPOSE: The present study aims to evaluate the agreement of three commonly used autorefractors in children and adolescents, and the potential for their interchangeable application in a large-scale study...
August 14, 2017: Optometry and Vision Science: Official Publication of the American Academy of Optometry
https://www.readbyqxmd.com/read/28814734/dipole-orientation-analysis-without-optical-simulation-application-to-thermally-activated-delayed-fluorescence-emitters-doped-in-host-matrix
#5
Takeshi Komino, Yuji Oki, Chihaya Adachi
The dipole orientation of guest emitters doped into host matrices is usually investigated by angular dependent photoluminescence (PL) measurements, which acquire an out-of-plane PL radiation pattern of the guest-host thin films. The PL radiation patterns generated by these methods are typically analysed by optical simulations, which require expertise to perform and interpret in the simulation. In this paper, we developed a method to calculate an orientational order parameter S without the use of full optical simulations...
August 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28813575/subclinical-decrease-in-central-inner-retinal-activity-is-associated-with-myopia-development-in-children
#6
Serena Zhe-Chuang Li, Wing-Yan Yu, Kai-Yip Choi, Christie Hang-I Lam, Yamunadevi Lakshmanan, Francisca Siu-Yin Wong, Henry Ho-Lung Chan
Purpose: To investigate the characteristics of retinal electrophysiological activity in relation to early myopia development in children. Methods: Fifty-six children aged 6 to 9 years with emmetropic refractive error (defined as ≥ -0.5 diopter [D] and ≤ +0.5 D) were recruited. Cycloplegic refraction, axial length, and global flash multifocal electroretinogram (MOFO mfERG) at 49% and 96% contrast levels were recorded in all children at their first visit. The refraction and axial length measurements were repeated after 1 year...
August 1, 2017: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/28808774/-refractive-lenticule-extraction-the-relex-smile-technique-video-article
#7
REVIEW
M Blum, W Sekundo
Refractive lenticule extraction (ReLEx/SMILE) is a refractive surgical method developed by the authors in stages primarily for correction of myopia and myopic astigmatism, in which a femtosecond laser is exclusively used. In the (ReLEx/SMILE) method a refractive lenticule is generated by the femtosecond laser, which is subsequently extracted through a small incision. Opening of the corneal surface with a flap and use of an excimer laser is no longer necessary. In 2013 the method was newly assessed and classified by the Joint Commisssion for Refractive Surgery (KRC) of the Professional Association of Ophthalmologists (BVA) and the German Ophthalmological Society (DOG)...
August 14, 2017: Der Ophthalmologe: Zeitschrift der Deutschen Ophthalmologischen Gesellschaft
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
#8
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/28808597/visual-evoked-potentials-in-primary-open-angle-glaucoma
#9
Mukesh Kumar Jha, Dilip Thakur, Nirmala Limbu, Badri Prasad Badhu, Bishnu Hari Paudel
BACKGROUND AND AIMS: Visual evoked potentials (VEPs) assess the integrity of the visual pathways from the optic nerve to the occipital cortex. Optic disc cupping and visual field loss have been associated with prolongation of latency of VEP in primary open angle glaucoma (POAG). METHODS: Pattern reversal and flash VEP tests were done in consenting 20 primary open angle glaucoma eyes and 40 normal control eyes. RESULTS: In POAG cases, the refractive error [3...
2017: Journal of Neurodegenerative Diseases
https://www.readbyqxmd.com/read/28801741/scleral-suture-fixation-technique-for-dislocated-plate-haptic-toric-iol
#10
Remzi Karadag, Bahar Gunes, Veysel Aykut, Halit Oguz, Ahmet Demirok
Purpose We describe a scleral suture fixation technique for dislocated plate haptic toric intraocular lens (IOL) implantation. Materials and methods A double-armed 10-0 straight polypropylene suture was passed into the eye from the sclera (2 mm away from the limbus). A suture needle was passed through the hole on the corner of the IOL and pulled out from the paracentesis with a 27-gauge needle. Afterward, the suture needle was reinserted from the same paracentesis and then removed from the eye with the help of a 27-gauge needle entering the eye from a nearby point to the first scleral entrance...
August 11, 2017: International Ophthalmology
https://www.readbyqxmd.com/read/28799958/learning-curve-of-small-incision-lenticule-extraction-challenges-and-complications
#11
Jeewan S Titiyal, Manpreet Kaur, Anubha Rathi, Ruchita Falera, Manthan Chaniyara, Namrata Sharma
PURPOSE: To describe the intraoperative complications observed during the initial learning curve of small incision lenticule extraction (SMILE) and their management. METHODS: Prospective evaluation of 100 consecutive eyes (50 patients) undergoing SMILE was performed at an apex tertiary care ophthalmic center. Patients older than 18 years with a stable refractive error ranging from -1.0 to -10.0 D myopia and up to 3.0 D astigmatism were included. Any intraoperative complications and their management were noted...
August 9, 2017: Cornea
https://www.readbyqxmd.com/read/28797099/prevalence-of-visual-impairment-and-outcomes-of-cataract-surgery-in-chaonan-south-china
#12
Xiujuan Zhang, Emmy Y Li, Christopher Kai-Shun Leung, David C Musch, Xin Tang, Chongren Zheng, Mingguang He, David F Chang, Dennis Shun-Chiu Lam
PURPOSE: To estimate the prevalence and causes of blindness and visual impairment (VI), and report the outcomes of cataract surgery in Chaonan Region, Guangdong Province, southern China. DESIGN: Cross-sectional population-based survey. PARTICIPANTS: A total of 3484 participants including 1397 men (40.1%) and 2087 women (59.9%) aged ≥50 years were examined (94.2% response rate). METHOD: A two-stage cluster sampling procedure was used to select 3700 participants aged ≥50 years from 74 clusters of Chaonan Region...
2017: PloS One
https://www.readbyqxmd.com/read/28793183/utilisation-of-eye-health-care-services-in-australia-the-national-eye-health-survey
#13
Joshua Foreman, Jing Xie, Stuart Keel, Hugh R Taylor, Mohamed Dirani
IMPORTANCE: National data on eye healthcare service utilisation will inform Australia's eye health policy. BACKGROUND: To investigate the utilisation of eye healthcare services by Australians. DESIGN: Cross-sectional survey PARTICIPANTS: Indigenous Australians aged 40 years and older and non-Indigenous Australians aged 50 years and older. METHODS: 1738 Indigenous Australians and 3098 non-Indigenous Australians were recruited from 30 randomly-selected sites, stratified by remoteness...
August 9, 2017: Clinical & Experimental Ophthalmology
https://www.readbyqxmd.com/read/28792669/an-improved-algorithm-for-fast-resonant-mie-scatter-correction-of-infrared-spectra-of-cells-and-tissues
#14
Tatiana Konevskikh, Rozalia Lukacs, Achim Kohler
Mie scattering effects create serious problems for the interpretation of FTIR spectra of single cells and tissues. During recent years, different techniques were proposed to retrieve pure absorbance spectra from spectra with Mie distortions. Recently, we published an iterative algorithm for correcting Mie scattering in spectra of single cells and tissues, which we called 'the fast resonant Mie scatter correction algorithm'. The algorithm is based on extended multiplicative signal correction (EMSC) and employs a meta-model for a parameter range of refractive index and size parameters...
August 9, 2017: Journal of Biophotonics
https://www.readbyqxmd.com/read/28791059/risk-factors-for-pterygium-in-ilam-province-iran
#15
Parviz Malekifar, Hamed Esfandiari, Nazanin Behnaz, Fatemeh Javadi, Sima Azish, Mohammad Ali Javadi, Masumeh Kalantarion
PURPOSE: To evaluate the risk factors for pterygium in the dry, high altitude province of Ilam, Iran. METHODS: The study included patients who presented to ophthalmology clinic. The patients were divided into two groups: 210 diagnosed with pterygium or pinguecula (unilateral or bilateral), and 210 healthy controls. Demographic variables, living environment, disease type, disease laterality, family history of pterygium as well as history of smoking, working outdoors, baking, welding, ocular conditions (trachoma keratopathy, glaucoma, refractive error, and dry eye), use of glasses, ultraviolet light exposure, and systemic conditions were collected from both groups and compared for risk assessment...
July 2017: Journal of Ophthalmic & Vision Research
https://www.readbyqxmd.com/read/28780995/agreement-between-total-corneal-astigmatism-calculated-by-vector-summation-and-total-corneal-astigmatism-measured-by-ray-tracing-using-galilei-double-scheimpflug-analyzer
#16
Sepehr Feizi, Siamak Delfazayebaher, Vahid Ownagh, Fatemeh Sadeghpour
PURPOSE: To evaluate the agreement between total corneal astigmatism calculated by vector summation of anterior and posterior corneal astigmatism (TCAVec) and total corneal astigmatism measured by ray tracing (TCARay). METHODS: This study enrolled a total of 204 right eyes of 204 normal subjects. The eyes were measured using a Galilei double Scheimpflug analyzer. The measured parameters included simulated keratometric astigmatism using the keratometric index, anterior corneal astigmatism using the corneal refractive index, posterior corneal astigmatism, and TCARay...
August 3, 2017: Journal of Optometry
https://www.readbyqxmd.com/read/28780776/intraocular-lens-power-calculation-in-eyes-after-laser-in-situ-keratomileusis-or-photorefractive-keratectomy-for-myopia
#17
Adi Abulafia, Warren E Hill, Li Wang, Olga Reitblat, Douglas D Koch
Intraocular power calculation is challenging for patients who have previously undergone corneal refractive surgery. The sources of prediction errors for these eyes are well known; however, the numerous formulas and methods available for calculating intraocular lens power in these cases are eloquent testimony to the absence of a definitive solution. This review discusses some of the available methods for improving the accuracy for predicting the refractive outcome for these patients. It focuses mainly on the methods available on the American Society of Cataract and Refractive Surgery (ASCRS) online calculator and provides some practical guidelines for cataract surgeons who encounter these challenging cases...
July 2017: Asia-Pacific Journal of Ophthalmology
https://www.readbyqxmd.com/read/28780619/evaluation-of-optic-disc-retinal-nerve-fiber-and-macular-ganglion-cell-layers-in-pediatric-diabetes
#18
Evre Pekel, Selda Ayça Altıncık, Gökhan Pekel
PURPOSE: Our aim was to compare optic disc parameters, retinal nerve fiber (RNFL) and macular ganglion cell layers between children and adolescents with diabetes mellitus (type 1) and healthy controls. METHODS: Sixty-three eyes of 63 pediatric diabetic patients without diabetic retinopathy and 44 eyes of 44 healthy controls were included in this cross-sectional and comparative study. Diabetic and control groups were similar in the aspect of age, gender and refractive error...
August 5, 2017: International Ophthalmology
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
#19
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/28777775/induced-de-novo-astigmatism-after-hyperopic-lasik-versus-myopic-lasik-surgery-in-nonastigmatic-eyes
#20
Lily Karmona, Michael Mimouni, Igor Vainer, Tzahi Sela, Gur Munzer, Igor Kaiserman
PURPOSE: To compare the astigmatism induced surgically (SIA) by spherical hyperopic laser in situ keratomileusis (H-LASIK) versus myopic laser in situ keratomileusis (M-LASIK) in nonastigmatic eyes. METHODS: A retrospective study of patients who underwent LASIK surgery between 2005 and 2014 at the Care-Vision Laser Center, Israel. We calculated the mean absolute SIA and performed risk factor analysis for induced astigmatism. Differences between H-LASIK and M-LASIK were analyzed...
September 2017: Cornea
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