keyword
MENU ▼
Read by QxMD icon Read
search

Refractive error

keyword
https://www.readbyqxmd.com/read/28646337/-epidemiology-of-refractive-errors
#1
C Wolfram
Refractive errors are very common and can lead to severe pathological changes in the eye. This article analyzes the epidemiology of refractive errors in the general population in Germany and worldwide and describes common definitions for refractive errors and clinical characteristics for pathologicaal changes. Refractive errors differ between age groups due to refractive changes during the life time and also due to generation-specific factors. Current research about the etiology of refractive errors has strengthened the influence of environmental factors, which led to new strategies for the prevention of refractive pathologies...
June 23, 2017: Der Ophthalmologe: Zeitschrift der Deutschen Ophthalmologischen Gesellschaft
https://www.readbyqxmd.com/read/28643717/spectacles-use-in-a-rural-population-in-the-state-of-telangana-in-south-india
#2
Srinivas Marmamula, Rohit C Khanna, Eswararao Kunuku, Gullapalli N Rao
CONTEXT: Uncorrected refractive errors are the leading cause of visual impairment. AIMS: To assess the prevalence and patterns of spectacles use among those aged ≥40 years in the South Indian state of Telangana. SETTINGS AND DESIGN: This was a population-based, cross-sectional study, in which 6150 people were enumerated from 123 clusters in the two districts of Telangana state (Adilabad and Mahbubnagar) using a two-stage cluster random sampling methodology...
June 2017: Indian Journal of Ophthalmology
https://www.readbyqxmd.com/read/28643716/prevalence-of-ocular-morbidity-in-school-going-children-in-west-uttar-pradesh
#3
Veer Singh, K P S Malik, V K Malik, Kirti Jain
AIM OF THE STUDY: This study aims to evaluate the prevalence and to make a comparison between the ocular morbidity pattern in school going children of urban and rural areas of West Uttar Pradesh. MATERIALS AND METHODS: A school-based cross-sectional study design was adopted to examine children aged 5-15 years in randomly selected urban and rural schools of West Uttar Pradesh from June 2012 to August 2014. An optometrist did the vision and refraction, and a detailed ophthalmic examination was done by an ophthalmologist...
June 2017: Indian Journal of Ophthalmology
https://www.readbyqxmd.com/read/28643407/childhood-exposure-to-constricted-living-space-a-possible-environmental-threat-for-myopia-development
#4
Kai Yip Choi, Wing Yan Yu, Christie Hang I Lam, Zhe Chuang Li, Man Pan Chin, Yamunadevi Lakshmanan, Francisca Siu Yin Wong, Chi Wai Do, Paul Hong Lee, Henry Ho Lung Chan
PURPOSE: People in Hong Kong generally live in a densely populated area and their homes are smaller compared with most other cities worldwide. Interestingly, East Asian cities with high population densities seem to have higher myopia prevalence, but the association between them has not been established. This study investigated whether the crowded habitat in Hong Kong is associated with refractive error among children. METHODS: In total, 1075 subjects [Mean age (S...
June 22, 2017: Ophthalmic & Physiological Optics: the Journal of the British College of Ophthalmic Opticians (Optometrists)
https://www.readbyqxmd.com/read/28639450/-bilateral-congenital-multiple-pigmented-vitreous-cysts-in-a%C3%A2-three-year-old-girl-ten-years-follow-up
#5
J Štěpánková, M Hósová, D Dotřelová
The authors present a case report of a three-year-old female patient with bilateral multiple anterior vitreous cysts. During examination for intermittent esotropia of the right eye was diagnosed not only hypermetropia, astigmatism and anisometropia, but also pigmented changes in peripheral retrolental space of both eyes. Clinical examination under general anaesthesia revealed bilateral multiple pigmented immobile vitreous cysts. There were five almost spherical, translucent, but slightly pigmented cysts on its cover on the right eye and four similar on the left, but visible only with dilated pupils...
2017: Ceská a Slovenská Oftalmologie
https://www.readbyqxmd.com/read/28639449/-optic-properties-of-myopic-correction-by-orthokeratology-contact-lenses-a-case-report
#6
M Mýlková, F Pluháček
INTRODUCTION: Orthokeratology lenses present a special type of hard contact lenses, which is used especially for myopic correction. The lenses are applied during the night, when thanks to their special shape cause temporally (reversible) change of the cornea shape. During the day, there is not necessary to wear any other refractive correction. Due to the wearing regimen, there is, comparing to the classical contact lenses, higher risk of health complications. For their safe use, it is necessary to pay attention to the application of lenses of adequate parameters, follow up the care and hygiene precautions, regular controls and early treatment of possible problems...
2017: Ceská a Slovenská Oftalmologie
https://www.readbyqxmd.com/read/28639168/sensitivity-of-chaos-measures-in-detecting-stress-in-the-focusing-control-mechanism-of-the-short-sighted-eye
#7
Karen M Hampson, Matthew P Cufflin, Edward A H Mallen
When fixating on a stationary object, the power of the eye's lens fluctuates. Studies have suggested that changes in these so-called microfluctuations in accommodation may be a factor in the onset and progression of short-sightedness. Like many physiological signals, the fluctuations in the power of the lens exhibit chaotic behaviour. A breakdown or reduction in chaos in physiological systems indicates stress to the system or pathology. The purpose of this study was to determine whether the chaos in fluctuations of the power of the lens changes with refractive error, i...
June 21, 2017: Bulletin of Mathematical Biology
https://www.readbyqxmd.com/read/28639088/comparison-of-visual-acuity-measurements-via-three-different-methods-in-preschool-children-lea-symbols-crowded-lea-symbols-snellen-e-chart
#8
Asli Inal, Osman Bulut Ocak, Ebru Demet Aygit, Ihsan Yilmaz, Berkay Inal, Muhittin Taskapili, Birsen Gokyigit
PURPOSE: The aim of this study was to compare three different methods to measure visual acuity (VA) in healthy and amblyopic preschool children: a Snellen E chart (SE), a single Lea symbols (SLS), and a crowded Lea symbols (CLS). METHODS: Seventy-eight eyes of 54 patients (28 females, 26 males) were included in this cross-sectional, comparative study. The control group consisted of 30 healthy cases, and the amblyopic group consisted of 24 patients with amblyopia...
June 20, 2017: International Ophthalmology
https://www.readbyqxmd.com/read/28639087/haigis-and-srkt-formulae-accuracy-for-intentional-myopic-overcorrection
#9
Rodrigo Faeda Dalto, Miriam A Ferreira, Wilian Queiroz, Roberto Pinto Coelho, Jayter Silva Paula, Andre Messias
PURPOSE: To investigate the influence of preoperative biometric parameters on the accuracy of Haigis and SRKT formulae in predicting postoperative target refraction. METHODS: Retrospective analysis of 108 eyes (70 patients) underwent uneventful phacoemulsification surgery with implant of Alcon-SN60WF intraocular lens (IOL). Forty-five eyes were intentionally targeted to myopia (-0.75 to -1.25 dpt), while the others targeted between 0 and -0.75 dpt. Preoperative axial length and keratometry (K) were measured with optical biometry (LENSTAR-Haag-Streit)...
June 21, 2017: International Ophthalmology
https://www.readbyqxmd.com/read/28634928/comparison-of-formulas-and-methods-for-high-myopia-patients-requiring-intraocular-lens-powers-less-than-six-diopters
#10
Harry S Geggel
PURPOSE: To determine the best method to minimize postoperative hyperopia and achieve mild myopia in patients requiring low-powered (<6.00 D) MN60MA intraocular lenses (IOLs). METHODS: This retrospective non-comparative case series consists of 32 eyes (20 patients). Postoperative spherical equivalent (SE) refractions were compared using four methods: standard formulas with varying target refractions (Haigis -1.00 D, Hoffer Q -1.75 D, Holladay 1 -1.50 D and SRK/T -1...
June 20, 2017: International Ophthalmology
https://www.readbyqxmd.com/read/28630786/ophthoselfie-detailed-self-imaging-of-cornea-and-anterior-segment-by-smartphone
#11
Abdullah Kaya
OBJECTIVES: To describe the ophthoselfie, a method by which everyone can take detailed self-images of the cornea and anterior segment with a smartphone. MATERIALS AND METHODS: A 90-diopter non-contact double aspheric lens was attached to posterior camera of the smartphone by clear tape. Images of one eye on the screen of the smartphone could be seen with the other eye in the mirror and images were taken. RESULTS: Accurate and detailed images of the cornea and anterior segment of the eye could be taken...
June 2017: Turkish Journal of Ophthalmology
https://www.readbyqxmd.com/read/28628489/shifting-of-the-line-of-sight-in-tilted-disk-syndrome
#12
Pinar Kosekahya, Ozge Sarac, Mustafa Koc, Mehtap Caglayan, Gozde Hondur, Nurullah Cagil
OBJECTIVES: To investigate the shifting of the line of sight (LoS) and the refractive, topographic, and aberrometric parameters that may be associated with the shifting of the LoS in eyes with tilted disk syndrome (TDS). METHODS: Eighty left eyes of 80 subjects with TDS (Study Group) and 70 left eyes of 70 subjects with myopia and astigmatism (Control Group) were included in this study. Line-of-sight coordinates on the horizontal (x) and vertical (y) axes, refractive, topographic, and aberrometric parameters were evaluated...
June 16, 2017: Eye & Contact Lens
https://www.readbyqxmd.com/read/28626818/astigmatic-treatment-with-photorefractive-keratectomy-investigations-of%C3%A2-non-keratometric-ocular-astigmatism
#13
Alireza Peyman, Zahra Dastborhan, Mohammadreza Peyman
PURPOSE: To evaluate the effect of non-keratometric ocular astigmatisms on visual and refractive outcomes after photorefractive keratectomy (PRK) for correction of myopic astigmatisms. METHODS: Seventy one eyes of 36 subjects were enrolled in this study. Patients underwent PRK for treatment of myopia. Subjects were evaluated for refractive error, keratometry, and visual acuity before and six months after surgery. Pre- and post-op non-keratometric astigmatisms were calculated by vectorial analysis of the difference between the corneal plane refractive astigmatism and keratometric astigmatism...
June 2017: Journal of Current Ophthalmology
https://www.readbyqxmd.com/read/28625971/peripheral-leptochoroid-clinical-and-anatomical-findings
#14
Jasmine H Francis, Larissa A Habib, David H Abramson
BACKGROUND/AIMS: To investigate the clinical findings and anatomical characteristics of patients with a thinned peripheral choroid (leptochoroid) presenting with bilateral macular geographical hyperpigmented fundus and compare with matched controls. METHODS: A retrospective, observational case series of 44 eyes (24 patients): 22 study eyes (12 study patients) with clinical findings of leptochoroid (geographical hyperpigmented fundus centred in the macula) matched with 22 control eyes (12 control patients)...
June 16, 2017: British Journal of Ophthalmology
https://www.readbyqxmd.com/read/28624326/randomized-trial-on-illuminated-microcatheter-circumferential-trabeculotomy-versus-conventional-trabeculotomy-in-congenital-glaucoma
#15
Jyoti Shakrawal, Shveta Bali, Talvir Sidhu, Saurabh Verma, Ramanjit Sihota, Tanuj Dada
PURPOSE: To compare one year outcomes of illuminated microcatheter-assisted circumferential trabeculotomy(IMCT) vs conventional partial trabeculotomy(CPT) for Primary Congenital Glaucom (PCG). DESIGN: Randomized clinical trial METHODS: Forty eyes of 31 patients with unilateral or bilateral primary congenital glaucoma aged less than two years were randomized to undergo IMCT (20 eyes) or CPT (20 eyes). Primary outcome measure was IOP reduction. The success criterion was defined as intraocular pressure (IOP) ≤ 12 mm Hg without and with anti-glaucoma medications (absolute success and qualified success respectively)...
June 14, 2017: American Journal of Ophthalmology
https://www.readbyqxmd.com/read/28624312/non-lens-based-surgical-techniques-for-presbyopia-correction
#16
R Bilbao-Calabuig, F Llovet-Osuna
INTRODUCTION: Presbyopia is the most prevalent refractive error. With a progressive aging population, its surgical correction is an important challenge for the ophthalmology community, as well as the millions of patients who suffer from it, and who are increasingly demanding alternatives to its correction with glasses or contact lenses. MATERIAL AND METHODS: A review is presented with a synthesised discussion on the pathophysiological theories of presbyopia and an updated and analytical description of the non-lens involvement surgical techniques used to treat presbyopia...
June 14, 2017: Archivos de la Sociedad Española de Oftalmología
https://www.readbyqxmd.com/read/28622398/axial-length-variation-impacts-on-superficial-retinal-vessel-density-and-foveal-avascular-zone-area-measurements-using-optical-coherence-tomography-angiography
#17
Danuta M Sampson, Peijun Gong, Di An, Moreno Menghini, Alex Hansen, David A Mackey, David D Sampson, Fred K Chen
Purpose: To evaluate the impact of image magnification correction on superficial retinal vessel density (SRVD) and foveal avascular zone area (FAZA) measurements using optical coherence tomography angiography (OCTA). Methods: Participants with healthy retinas were recruited for ocular biometry, refraction, and RTVue XR Avanti OCTA imaging with the 3 × 3-mm protocol. The foveal and parafoveal SRVD and FAZA were quantified with custom software before and after correction for magnification error using the Littman and the modified Bennett formulae...
June 1, 2017: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/28622329/plastic-modification-of-the-cornea-by-pneumatic-force-corrects-myopia-pneumatic-keratology
#18
A Medina
PurposeThe eyeball and, in particular, the cornea deform in vitro by the application of a distending force like other visco-elastic tissue. If the force is large enough, the cornea strains beyond the elastic range, and a permanent deformation occurs. Such permanent strain is referred to as 'plastic' strain. The phenomenon, however, has never been observed or produced on living tissue. This report seeks to demonstrate that the central radius of a patient's cornea can be altered in a controlled manner designed to correct refractive errors...
June 16, 2017: Eye
https://www.readbyqxmd.com/read/28621840/association-of-disease-specific-causes-of-visual-impairment-and-10-year-mortality-among-indigenous-australians-the-central-australian-ocular-health-study
#19
José Estevez, Georgia Kaidonis, Tim Henderson, Jamie E Craig, John Landers
IMPORTANCE: Visual impairment significantly impairs the length and quality of life but little is known of its impact in Indigenous Australians. BACKGROUND: To investigate the association of disease-specific causes of visual impairment with all-cause mortality. DESIGN: Retrospective cohort analysis. PARTICIPANTS: 1,347 Indigenous Australians aged over 40 years. METHODS: Participants visiting remote medical clinics underwent clinical examinations including visual acuity, subjective refraction and slit-lamp examination of the anterior and posterior segments...
June 16, 2017: Clinical & Experimental Ophthalmology
https://www.readbyqxmd.com/read/28617854/choroidal-thickness-in-school-children-the-gobi-desert-children-eye-study
#20
Dan Zhu, Yan Wang, Yan Fei Zheng, Da Yong Yang, Kai Guo, Xian Rong Yang, Xin Xia Jing, Ian Y Wong, Qi Sheng You, Yong Tao, Jost B Jonas
PURPOSE: To investigate choroidal thickness (CT) and its associations in children in a school-based study. METHODS: The cross-sectional school-based Gobi Desert Children Eye Study included 1565 out of 1911 (81.9%) eligible children from all schools in the oasis region of Ejina in the Gobi Desert. A detailed ophthalmic examination was performed, including spectral-domain optical coherence tomography with enhanced depth imaging for CT measurement. RESULTS: CT measurements were available for 1463 (93...
2017: PloS One
keyword
keyword
47842
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"