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Refractive error

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https://www.readbyqxmd.com/read/29453222/clear-lens-extraction-for-the-management-of-primary-angle-closure-glaucoma-surgical-technique-and-refractive-outcomes-in-the-eagle-cohort
#1
Alexander C Day, David Cooper, Jennifer Burr, Paul J Foster, David S Friedman, Gus Gazzard, Jemaima Che-Hamzah, Tin Aung, Craig R Ramsay, Augusto Azuara-Blanco
BACKGROUND: To describe the surgical technique and refractive outcomes following clear lens extraction (CLE) in the Effectiveness, in Angle-closure Glaucoma, of Lens Extraction trial. METHODS: Review of prospectively collected data from a multicentre, randomised controlled trial comparing CLE and laser peripheral iridotomy. Eligible participants were ≥50 years old and newly diagnosed with (1) primary angle closure (PAC) with intraocular pressure above 30 mm Hg or (2) PAC glaucoma...
February 16, 2018: British Journal of Ophthalmology
https://www.readbyqxmd.com/read/29450545/use-of-the-posterior-anterior-corneal-curvature-radii-ratio-to-improve-the-accuracy-of-intraocular-lens-power-calculation-eom-s-adjustment-method
#2
Mingue Kim, Youngsub Eom, Hwa Lee, Young-Woo Suh, Jong Suk Song, Hyo Myung Kim
Purpose: To evaluate the accuracy of IOL power calculation using adjusted corneal power according to the posterior/anterior corneal curvature radii ratio. Methods: Nine hundred twenty-eight eyes from 928 reference subjects and 158 eyes from 158 cataract patients who underwent phacoemulsification surgery were enrolled. Adjusted corneal power of cataract patients was calculated using the fictitious refractive index that was obtained from the geometric mean posterior/anterior corneal curvature radii ratio of reference subjects and adjusted anterior and predicted posterior corneal curvature radii from conventional keratometry (K) using the posterior/anterior corneal curvature radii ratio...
February 1, 2018: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/29450383/eyesight-quality-and-computer-vision-syndrome
#3
Camelia Margareta Bogdănici, Diana Elena Săndulache, Corina Andreea Nechita
The aim of the study was to analyze the effects that gadgets have on eyesight quality. A prospective observational study was conducted from January to July 2016, on 60 people who were divided into two groups: Group 1 - 30 middle school pupils with a mean age of 11.9 ± 1.86 and Group 2 - 30 patients evaluated in the Ophthalmology Clinic, "Sf. Spiridon" Hospital, Iași, with a mean age of 21.36 ± 7.16 years. The clinical parameters observed were the following: visual acuity (VA), objective refraction, binocular vision (BV), fusional amplitude (FA), Schirmer's test...
April 2017: Romanian Journal of Ophthalmology
https://www.readbyqxmd.com/read/29447172/knowledge-attitude-and-associated-factors-among-primary-school-teachers-regarding-refractive-error-in-school-children-in-gondar-city-northwest-ethiopia
#4
Abiy Maru Alemayehu, Gizchewu Tilahun Belete, Nebiyat Feleke Adimassu
INTRODUCTION: Refractive error is an important cause of correctable visual impairment in the worldwide with a global distribution of 1.75% to 20.7% among schoolchildren. Teacher's knowledge about refractive error play an important role in encouraging students to seek treatment that helps in reducing the burden of visual impairment. OBJECTIVE: To determine knowledge, attitude and associated factors among primary school teachers regarding refractive error in school children in Gondar city...
2018: PloS One
https://www.readbyqxmd.com/read/29446439/vision-screening-for-correctable-visual-acuity-deficits-in-school-age-children-and-adolescents
#5
REVIEW
Jennifer R Evans, Priya Morjaria, Christine Powell
BACKGROUND: Although the benefits of vision screening seem intuitive, the value of such programmes in junior and senior schools has been questioned. In addition there exists a lack of clarity regarding the optimum age for screening and frequency at which to carry out screening. OBJECTIVES: To evaluate the effectiveness of vision screening programmes carried out in schools to reduce the prevalence of correctable visual acuity deficits due to refractive error in school-age children...
February 15, 2018: Cochrane Database of Systematic Reviews
https://www.readbyqxmd.com/read/29444785/longitudinal-changes-in-intraocular-pressure-and-association-with-systemic-factors-and-refractive-error-lingtou-eye-cohort-study
#6
Xiaotong Han, Tangjian Yang, Jian Zhang, Sha Yu, Xinxing Guo, William Yan, Yin Hu, Mingguang He
OBJECTIVES: To investigate the longitudinal changes in intraocular pressure (IOP) and its associations with refractive error and systemic determinants in a Chinese geriatric population. DESIGN: Prospective cohort study. SETTING: Guangzhou Government Servant Physical Check-up Center, Guangzhou, China. PARTICIPANTS: 4413 government employees aged no less than 40 years (41.9% female) attending annual physical and eye examinations were included in this study...
February 14, 2018: BMJ Open
https://www.readbyqxmd.com/read/29439666/prevalence-and-causes-of-low-vision-and-blindness-in-an-elderly-population-in-nepal-the-bhaktapur-retina-study
#7
Raba Thapa, Sanyam Bajimaya, Govinda Paudyal, Shankar Khanal, Stevie Tan, Suman S Thapa, G H M B van Rens
BACKGROUND: This study aims to explore the prevalence and causes of low vision and blindness focused on retinal disease in a population above 60 years in Nepal. METHODS: Two thousand one hundred subjects were enrolled in a population-based cross-sectional study. History, presenting and best corrected visual acuity after subjective refraction, anterior and posterior segment examinations was obtained in detail. RESULTS: Among the total subjects, 1860 (88...
February 13, 2018: BMC Ophthalmology
https://www.readbyqxmd.com/read/29439090/blindness-low-vision-and-cataract-surgery-outcome-among-adults-in-hohhot-of-inner-mongolia-a-rapid-assessment-of-avoidable-blindness-raab-study
#8
Guisen Zhang, Yih-Chung Tham, Hui Gong, Fengmei Ren, Jilitu Morige, Wei Dai, Ching-Yu Cheng, Han Zhang, Lei Liu
BACKGROUND: To determine the prevalence and causes of visual impairment (VI), and to describe the characteristics of cataract surgery coverage and related barriers among adults aged ≥50 years residing in Hohhot, Inner Mongolia. METHODS: A population-based cross-sectional study was performed. Presenting visual acuity (PVA) was measured using the Rapid Assessment of Avoidable Blindness (RAAB) methodology. All VI cases were defined using the WHO definition, based on the PVA of the better-seeing eye...
February 8, 2018: British Journal of Ophthalmology
https://www.readbyqxmd.com/read/29437571/impact-of-varying-the-definition-of-myopia-on-estimates-of-prevalence-and-associations-with-risk-factors-time-for-an-approach-that-serves-research-practice-and-policy
#9
Phillippa M Cumberland, Vasiliki Bountziouka, Jugnoo S Rahi
BACKGROUND: Refractive error is an increasing global public health concern that requires robust and reliable research to identify modifiable risk factors and provide accurate estimates of population burden. We investigated the impact of reclassification of individuals when using different threshold values of spherical equivalent (SE) to define myopia, on estimates of frequency, distribution and associations with risk factors, to inform current international initiatives to standardise definitions...
February 3, 2018: British Journal of Ophthalmology
https://www.readbyqxmd.com/read/29436656/early-quantitative-profiling-of-differential-retinal-protein-expression-in-lens-induced-myopia-in-guinea-pig-using-fluorescence-difference-two-dimensional-gel-electrophoresis
#10
Yi Wu, Carly Siu-Yin Lam, Dennis Yan-Yin Tse, Chi Ho To, Quan Liu, Sally A McFadden, Rachel Ka-Man Chun, King Kit Li, Jianfang Bian, Chuen Lam
The current study aimed to investigate the differential protein expression in guinea pig retinas in response to lens-induced myopia (LIM) before fully compensated eye growth. Four days old guinea pigs (n=5) were subjected to ‑4D LIM for 8 days. Refractive errors were measured before and at the end of the lens wear period. Ocular dimensions were also recorded using high‑frequency A‑scan ultrasonography. After the LIM treatment, retinas of both eyes were harvested and soluble proteins were extracted. Paired retinal protein expressions in each animal were profiled and compared using a sensitive fluorescence difference two‑dimensional gel electrophoresis...
February 8, 2018: Molecular Medicine Reports
https://www.readbyqxmd.com/read/29433477/prevalence-and-causes-of-blindness-visual-impairment-among-different-ethnical-minority-groups-in-xinjiang-uygur-autonomous-region-china
#11
Yanping Li, Wenyong Huang, Aoyun Qiqige, Hongwei Zhang, Ling Jin, Pula Ti, Jennifer Yip, Baixiang Xiao
BACKGROUND: The aim of this cross-sectional study is to ascertain the prevalence and causes of blindness, visual impairment, uptake of cataract surgery among different ethnic groups in Xinjiang Uygur Autonomous Region, China. METHODS: Four thousand one hundred fifty people at 50 years and above from different minority ethnic groups were randomly selected for an eye examination. The four trained eye teams collected data using tumbling E visual chart, torch, portable slit lamp and direct ophthalmoscope in 2015...
February 13, 2018: BMC Ophthalmology
https://www.readbyqxmd.com/read/29429287/-observational-study-on-the-impact-of-corneal-power-on-refractive-status-of-patients-after-small-incision-lenticule-extraction-surgery
#12
T Liu, T Yu, J Pan, Y C Zou, L N Liu, Q X Kan, J Bai
Objective: To observe the change of refractive status and possible influencing factors for patients with different corneal power who underwent small incision lenticule extraction (SMILE) surgery. Methods: Prospective cohort study was performed for patients who underwent small incision lenticule extraction (SMILE) surgery at Daping Hospital and Research Institute of Surgery of Third Military Medical University between January and August 2016. The patients were divided into 3 groups according to their corneal power: low curvature group (K(1)≤41...
January 11, 2018: [Zhonghua Yan Ke za Zhi] Chinese Journal of Ophthalmology
https://www.readbyqxmd.com/read/29429284/-clinical-observation-on-corneal-transparency-after-small-incision-lenticule-extraction-surgery
#13
L Zhang, Y Wang, T Cui, W Zhao, W B Cheng
Objective: To evaluate the changes of corneal transparency over the 1-year period after small incision lenticule extraction (SMILE) according to corneal Scheimpflug densitometry. Methods: Prospective cohort study. Fifty-five patients (100 eyes) with myopia (19 male and 36 female, aged 18 to 39 years with average of 24) who underwent SMILE and regular follow-up for at least 1 year at Tianjin Eye Hospital were enrolled. Examinations took place before SMILE and postoperatively at 1 day, 1 week, and 1, 3, 6, and 12 months...
January 11, 2018: [Zhonghua Yan Ke za Zhi] Chinese Journal of Ophthalmology
https://www.readbyqxmd.com/read/29429282/-problems-and-challenges-in-the-development-of-corneal-refractive-surgery
#14
Y Wang, J Li
Corneal refractive surgery, as one of the common visual correction methods, has been increasingly accepted in China. There are a large number of people in China who undergo the corneal refractive surgery due to the high incidence of myopia in the country. It is essential that the safest and most effective surgery should be used to correct refractive errors in the cases involved with relatively normal eyes and corneas. In recent years, corneal refractive surgery has been rapidly developing with new technologies and techniques emerging all the time, such as SMILE (small incision lenticule extraction) surgery, which has been extensively applied in China since five years ago when it was approved by FDA...
January 11, 2018: [Zhonghua Yan Ke za Zhi] Chinese Journal of Ophthalmology
https://www.readbyqxmd.com/read/29426440/evaluation-and-surgical-outcome-of-acquired-nonaccommodative-esotropia-among-older-children
#15
Bo Li, Sapna Sharan
OBJECTIVE: To describe the presentation, clinical evaluation, work-up, surgical management, and surgical outcomes in children older than 8 years with spontaneous, comitant, acquired nonaccommodative esotropia (ANAET). DESIGN: Retrospective chart review. PARTICIPANTS: Children who underwent bilateral medial rectus recession surgery for ANAET with initial esotropia onset later than 8 years of age. METHODS: The medical records of children older than 8 years presenting with ANAET from 2009 to 2015 were retrospectively reviewed...
February 2018: Canadian Journal of Ophthalmology. Journal Canadien D'ophtalmologie
https://www.readbyqxmd.com/read/29425389/factors-influencing-cyclotorsion-during-photorefractive-keratectomy
#16
Fateme Alipour, Fateme Veisi Hampa, Elham Ashrafi, Shima Dehghani
PURPOSE: To determine predictive factors for intra-operative cyclotorsion in photorefractive keratectomy (PRK). METHODS: A retrospective statistical analysis of medical records pertaining to 3,996 eyes undergoing PRK was conducted. Outcome measures of this study were the likely existence of statistically significant relations between diverse and potentially influential factors and the occurrence of intraoperative cyclotorsion. RESULTS: A total of 96% of examined medical records indicated some degree of cyclotorsion with the absolute mean intraoperative value of 1...
February 1, 2018: Journal of Refractive Surgery
https://www.readbyqxmd.com/read/29424829/accommodative-function-in-individuals-with-autism-spectrum-disorder
#17
Pamela M Anketell, Kathryn J Saunders, Stephen M Gallagher, Clare Bailey, Julie-Anne Little
SIGNIFICANCE: Accommodative responses were significantly poorer in individuals with autism spectrum disorder (ASD) compared with age-matched typically developing control subjects, and hypoaccommodation was associated with reduced near visual acuity (NVA) and convergence. PURPOSE: Autism spectrum disorder is a neurodevelopmental disorder with a reported prevalence of 1.1 to 1.5%. Accommodative dysfunction has been noted in other developmental conditions including cerebral palsy and Down syndrome...
February 8, 2018: Optometry and Vision Science: Official Publication of the American Academy of Optometry
https://www.readbyqxmd.com/read/29422769/a-genome-wide-association-study-of-corneal-astigmatism-the-cream-consortium
#18
Rupal L Shah, Qing Li, Wanting Zhao, Milly S Tedja, J Willem L Tideman, Anthony P Khawaja, Qiao Fan, Seyhan Yazar, Katie M Williams, Virginie J M Verhoeven, Jing Xie, Ya Xing Wang, Moritz Hess, Stefan Nickels, Karl J Lackner, Olavi Pärssinen, Juho Wedenoja, Ginevra Biino, Maria Pina Concas, André Uitterlinden, Fernando Rivadeneira, Vincent W V Jaddoe, Pirro G Hysi, Xueling Sim, Nicholas Tan, Yih-Chung Tham, Sonoko Sensaki, Albert Hofman, Johannes R Vingerling, Jost B Jonas, Paul Mitchell, Christopher J Hammond, René Höhn, Paul N Baird, Tien-Yin Wong, Chinfsg-Yu Cheng, Yik Ying Teo, David A Mackey, Cathy Williams, Seang-Mei Saw, Caroline C W Klaver, Jeremy A Guggenheim, Joan E Bailey-Wilson
Purpose: To identify genes and genetic markers associated with corneal astigmatism. Methods: A meta-analysis of genome-wide association studies (GWASs) of corneal astigmatism undertaken for 14 European ancestry (n=22,250) and 8 Asian ancestry (n=9,120) cohorts was performed by the Consortium for Refractive Error and Myopia. Cases were defined as having >0.75 diopters of corneal astigmatism. Subsequent gene-based and gene-set analyses of the meta-analyzed results of European ancestry cohorts were performed using VEGAS2 and MAGMA software...
2018: Molecular Vision
https://www.readbyqxmd.com/read/29422753/investigating-the-visual-status-of-preschool-children-in-riyadh-saudi-arabia
#19
Ali M Alsaqr, Ghayda'a Ibrahim, Ali Abu Sharha, Raied Fagehi
PURPOSE: The purpose of the study was to explore the vision status of preschool children aged 3-6 years in Al Riyadh and to identify children at risk of amblyopia. MATERIALS AND METHODS: This was a cross-sectional population-based study. Visual acuity (VA) was measured using 15-line Lea symbols, refractive error was assessed using the Mohindra near retinoscopy technique, and peak contrast sensitivity (CS) was measured with the aid of the numerical CS test. We recruited 335 children, with their parents' written consent, from 14 kindergartens...
October 2017: Middle East African Journal of Ophthalmology
https://www.readbyqxmd.com/read/29422749/outcomes-of-scleral-fixated-intraocular-lens-in-children-with-idiopathic-ectopia-lentis
#20
Abdulaziz I Al Somali, Faisal N Al-Dossari, Khalid E Emara, Ahmed Al Habash
PURPOSE: The purpose of the study was to review the safety and stability of scleral-fixated intraocular lens (IOL) 2 years after implantation in children with idiopathic ectopia lentis (EL). METHODS: This retrospective case series enrolled children with EL managed between 2011 and 2015 at a tertiary eye hospital in the eastern of Saudi Arabia. Data were collected on age, gender, vision, isolated or syndromic pathology, intraoperative and postoperative complications, spherical equivalent refraction, and final best-corrected visual acuity (BCVA)...
October 2017: Middle East African Journal of Ophthalmology
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