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Ophthalmic Epidemiology

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https://www.readbyqxmd.com/read/28532291/using-key-informant-method-to-determine-the-prevalence-and-causes-of-childhood-blindness-in-south-eastern-nigeria
#1
Ada E Aghaji, Ifeoma R Ezegwui, Jude O Shiweobi, Cyril C Mamah, Mary N Okoloagu, Ernest N Onwasigwe
PURPOSE: To determine the prevalence and causes of childhood blindness in an underserved community in south-eastern Nigeria using the key informant method. METHODS: This was a descriptive cross-sectional study. Key informants (KI) appointed by their respective communities received 1-day training on identification of blind children in their communities. Two weeks later, the research team visited the agreed sites within the community and examined the identified children...
May 22, 2017: Ophthalmic Epidemiology
https://www.readbyqxmd.com/read/28532208/the-burden-of-and-risk-factors-for-trachoma-in-selected-districts-of-zimbabwe-results-of-16-population-based-prevalence-surveys
#2
Isaac Phiri, Portia Manangazira, Colin K Macleod, Takafira Mduluza, Tinashe Dhobbie, Shorai Grace Chaora, Chriswell Chigwena, Joshua Katiyo, Rebecca Willis, Ana Bakhtiari, Peter Bare, Paul Courtright, Boniface Macheka, Nicholas Midzi, Anthony W Solomon
BACKGROUND: Trachoma, a leading cause of blindness, is targeted for global elimination as a public health problem by 2020. In order to contribute to this goal, countries should demonstrate reduction of disease prevalence below specified thresholds, after implementation of the SAFE strategy in areas with defined endemicity. Zimbabwe had not yet generated data on trachoma endemicity and no specific interventions against trachoma have yet been implemented. METHODS: Two trachoma mapping phases were successively implemented in Zimbabwe, with eight districts included in each phase, in September 2014 and October 2015...
May 22, 2017: Ophthalmic Epidemiology
https://www.readbyqxmd.com/read/28532207/tutorial-on-biostatistics-statistical-analysis-for-correlated-binary-eye-data
#3
Gui-Shuang Ying, Maureen G Maguire, Robert Glynn, Bernard Rosner
PURPOSE: To describe and demonstrate methods for analyzing correlated binary eye data. METHODS: We describe non-model based (McNemar's test, Cochran-Mantel-Haenszel test) and model-based methods (generalized linear mixed effects model, marginal model) for analyses involving both eyes. These methods were applied to: (1) CAPT (Complications of Age-related Macular Degeneration Prevention Trial) where one eye was treated and the other observed (paired design); (2) ETROP (Early Treatment for Retinopathy of Prematurity) where bilaterally affected infants had one eye treated conventionally and the other treated early and unilaterally affected infants had treatment assigned randomly; and (3) AREDS (Age-Related Eye Disease Study) where treatment was systemic and outcome was eye-specific (both eyes in the same treatment group)...
May 22, 2017: Ophthalmic Epidemiology
https://www.readbyqxmd.com/read/28441120/prevalence-of-trachoma-in-northern-benin-results-from-11-population-based-prevalence-surveys-covering-26-districts
#4
Amadou Alfa Bio, Pelagie M Boko, Yannelle A Dossou, Jean-Jacques Tougoue, Achille Kabore, Ignace Sounouvou, Jean-Eudes Biaou, Lionel Nizigama, Paul Courtright, Anthony W Solomon, Lisa Rotondo, Wilfrid Batcho, Dorothée Kinde-Gazard
AIMS: We sought to evaluate trachoma prevalence in all suspected-endemic areas of Benin. METHODS: We conducted population-based surveys covering 26 districts grouped into 11 evaluation units (EUs), using a two-stage, systematic and random, cluster sampling design powered at EU level. In each EU, 23 villages were systematically selected with population proportional to size; 30 households were selected from each village using compact segment sampling. In selected households, we examined all consenting residents aged one year or above for trichiasis, trachomatous inflammation - follicular (TF), and trachomatous inflammation - intense...
April 25, 2017: Ophthalmic Epidemiology
https://www.readbyqxmd.com/read/28426334/myopigenic-activity-change-and-its-risk-factors-in-urban-students-in-beijing-three-year-report-of-beijing-myopia-progression-study
#5
Zhong Lin, Balamurali Vasudevan, Kenneth J Ciuffreda, Hong Jia Zhou, Guang Yun Mao, Ning Li Wang, Yuan Bo Liang
PURPOSE: To investigate the myopigenic activity change and its risk factors in urban students in Beijing. METHODS: A total of 241 primary or secondary students aged 6-17 years from the Beijing Myopia Progression Study (BMPS) were re-examined 3 years after their baseline enrollment. A detailed questionnaire was administered to assess myopigenic activities at both baseline and at the 3-year follow-up. Altogether, 217 students (90.0%) with completed data were included in the analysis...
April 20, 2017: Ophthalmic Epidemiology
https://www.readbyqxmd.com/read/28422552/rapid-assessment-of-avoidable-blindness-and-diabetic-retinopathy-in-gilan-province-iran
#6
Marzieh Katibeh, Hassan Behboudi, Siamak Moradian, Yousef Alizadeh, Ramin Beiranvand, Hamideh Sabbaghi, Hamid Ahmadieh
PURPOSE: To conduct an assessment of avoidable blindness and diabetic retinopathy (DR) in Gilan, 2014. METHODS: A cross-sectional population-based survey was performed on a representative sample of urban and rural individuals aged ≥50 years of the province. Blindness was defined as presenting visual acuity (PVA) <3/60 in the better eye. Moderate visual impairment (MVI) and severe visual impairment (SVI) were defined as 6/60 ≤ PVA <6/18 and 3/60 ≤ PVA <6/60 in the better eye, respectively...
April 19, 2017: Ophthalmic Epidemiology
https://www.readbyqxmd.com/read/28402722/prevalence-of-diabetic-retinopathy-in-urban-slums-the-aditya-jyot-diabetic-retinopathy-in-urban-mumbai-slums-study-report-2
#7
Mohan Sunita, Arvind Kumar Singh, Ashwini Rogye, Manish Sonawane, Ravina Gaonkar, Radhika Srinivasan, Sundaram Natarajan, Fred C J Stevens, A J J A Scherpbier, Govindasamy Kumaramanickavel, Catherine McCarty
OBJECTIVES: The aims of the study were to estimate the prevalence of diabetic retinopathy (DR) and enumerate history-based risk factors in the urban slums of Western India. METHODS: The population-based study was conducted in seven wards of Mumbai urban slums, where we screened 6569 subjects of ≥ 40 years age, with a response rate of 98.4%, for type 2 diabetes mellitus (T2DM) based on American Diabetes Association criteria. All subjects with T2DM underwent dilated 30° seven-field stereo-fundus-photography for DR severity grading based on modified Airlie House classification...
April 12, 2017: Ophthalmic Epidemiology
https://www.readbyqxmd.com/read/28402694/serum-phosphate-and-retinal-microvascular-changes-the-multi-ethnic-study-of-atherosclerosis-and-the-beaver-dam-eye-study
#8
Rupal Mehta, Alexander Hodakowski, Xuan Cai, Kris E Lee, Bryan R Kestenbaum, Ian H de Boer, Amani Fawzi, Tien Yin Wong, Joachim Ix, Barbara Klein, Ronald Klein, Tamara Isakova
PURPOSE: Higher levels of serum phosphate are strongly linked to increased risk of cardiovascular disease and therapies aimed to lower serum phosphate are employed in the management of patients with chronic kidney disease (CKD). Data are limited, however, on serum phosphate as a risk factor for microvascular disease in community-based populations. It is important to determine the impact of novel risk factors, such as phosphate, on the microvasculature. METHODS: We conducted a prospective study of 3919 individuals in the Multi-Ethnic Study of Atherosclerosis (MESA) and 3544 individuals in the Beaver Dam Eye Study (BDES) to test the associations of serum phosphate with retinopathy and retinal vessel caliber, and change in retinopathy severity and change in retinal vessel caliber...
April 12, 2017: Ophthalmic Epidemiology
https://www.readbyqxmd.com/read/28362137/magnitude-and-determinants-of-the-ratio-between-prevalence-of-low-vision-and-blindness-in-rapid-assessment-of-avoidable-blindness-surveys
#9
Dinesh Kaphle, Susan Lewallen
PURPOSE: To determine the magnitude and determinants of the ratio between prevalence of low vision and prevalence of blindness in rapid assessment of avoidable blindness (RAAB) surveys globally. METHODS: Standard RAAB reports were downloaded from the repository or requested from principal investigators. Potential predictor variables included prevalence of uncorrected refractive error (URE) as well as gross domestic product (GDP) per capita, health expenditure per capita of the country across World Bank regions...
March 31, 2017: Ophthalmic Epidemiology
https://www.readbyqxmd.com/read/28287899/retinal-vascular-caliber-and-kidney-function-in-children-and-adolescents-with-type-1-diabetes
#10
Stuart Keel, Catherine Itsiopoulos, Konstandina Koklanis, Meri Vukicevic, Fergus Cameron, Laima Brazionis
PURPOSE: To evaluate the relationship between retinal vascular caliber and kidney function in a cohort of Australian children and adolescents with type 1 diabetes. METHODS: This was a cross-sectional study of 483 children and adolescents with type 1 diabetes, aged 7-18 years. An audit of medical files of participants who attended the Royal Children's Hospital, Melbourne, between January 2009 and March 2014 was performed. Albumin to creatinine ratio (ACR) was acquired through spot urine samples and microalbuminuria was classified as ACR >3...
June 2017: Ophthalmic Epidemiology
https://www.readbyqxmd.com/read/28287870/the-use-of-key-informant-method-for-identifying-children-with-blindness-and-severe-visual-impairment-in-developing-countries
#11
Rènée du Toit, Paul Courtright, Susan Lewallen
PURPOSE: An estimated 19 million children are visually impaired; of these, 1.4 million are irreversibly blind. A key challenge is to identify them early in life to benefit maximally from visual rehabilitation, and/or treatment. This aggregative review and structured literature analysis summarizes evidence of what it is about the key informant (KI) approach that works to identify children with blindness or severe visual impairment (B/SVI) in the community (for whom, to what extent, in what circumstances, in what respect, how and why)...
June 2017: Ophthalmic Epidemiology
https://www.readbyqxmd.com/read/28276757/prevalence-awareness-and-risk-factors-of-diabetic-retinopathy-among-adults-with-known-type-2-diabetes-mellitus-in-an-urban-community-in-china
#12
Chen-Wei Pan, Shan Wang, Deng-Juan Qian, Cailian Xu, E Song
PURPOSE: To understand the prevalence, awareness, and risk factors for diabetic retinopathy (DR) among Chinese with known type-2 diabetes mellitus (T2DM) in eastern China communities. METHODS: A community-based survey including 913 patients with known T2DM was conducted in Suzhou, China. Diabetes was defined as hemoglobin A1c (hbA1c) ≥6.5%, use of diabetic medication or a physician diagnosis of diabetes. Retinal photographs were graded for the presence of DR using the Airlie House classification system...
June 2017: Ophthalmic Epidemiology
https://www.readbyqxmd.com/read/28276756/prevalence-of-dry-eye-in-uyghur-and-han-ethnic-groups-in-western-china
#13
Ying-Ying Gong, Fan Zhang, Jin Zhou, Jing Li, Guang-Hui Zhang, Jun-Liang Wang, Zhen-Sheng Gu
PURPOSE: To describe and compare the prevalence and characteristics of dry eye among Han and Uyghur persons living in Kashi, the most inland city of China. METHODS: A total of 1015 residents of Kashi participated in this 2013 cross-sectional study. To evaluate clinical characteristics, each subject completed (1) a dry-eye questionnaire detailing symptoms of dry eye, (2) Schirmer's I-test (SIT), (3) tear-film break-up time (BUT) test, and fluorescein staining of the cornea...
June 2017: Ophthalmic Epidemiology
https://www.readbyqxmd.com/read/28276755/prevalence-of-trachoma-in-kano-state-nigeria-results-of-44-local-government-area-level-surveys
#14
Caleb Mpyet, Nasiru Muhammad, Mohammed Dantani Adamu, Habila Muazu, Murtala Muhammad Umar, Musa Goyol, Hadi Bala Yahaya, Uwazoeke Onyebuchi, Chris Ogoshi, Tijjani Hussaini, Sunday Isiyaku, Adamani William, Rebecca M Flueckiger, Brian K Chu, Rebecca Willis, Alexandre L Pavluck, Nicholas Olobio, Sophie Phelan, Colin Macleod, Anthony W Solomon
PURPOSE: We sought to determine the prevalence of trachoma in 44 Local Government Areas (LGAs) of Kano State, Nigeria. METHODS: A population-based prevalence survey was conducted in each Kano LGA. We used a two-stage systematic and quasi-random sampling strategy to select 25 households from each of 25 clusters in each LGA. All consenting household residents aged 1 year and above were examined for trachomatous inflammation-follicular (TF), trachomatous inflammation-intense (TI) and trichiasis...
June 2017: Ophthalmic Epidemiology
https://www.readbyqxmd.com/read/28139151/age-related-macular-degeneration-and-mortality-a-systematic-review-and-meta-analysis
#15
Myra B McGuinness, Amalia Karahalios, Robert P Finger, Robyn H Guymer, Julie A Simpson
PURPOSE: Age-related macular degeneration (AMD) is the leading cause of severe, irreversible vision loss in older adults. Evidence for an association between AMD and mortality remains inconclusive despite evidence for an association with cardiovascular and inflammatory diseases. We aim to compare all-cause, cardiovascular and cancer mortality between those with early or late AMD and control study participants. METHODS: A protocol was registered at PROSPERO (CRD42015020622)...
June 2017: Ophthalmic Epidemiology
https://www.readbyqxmd.com/read/28045563/multivariable-regression-model-of-the-euroqol-5-dimension-questionnaire-in-patients-seeking-outpatient-low-vision-rehabilitation
#16
Alexis G Malkin, Judith E Goldstein, Robert W Massof
PURPOSE: To understand the source of between-person variance in baseline health utilities estimated from EuroQol 5-dimension questionnaire (EQ-5D) responses of a representative sample of the US low vision outpatient population prior to rehabilitation. METHODS: A prospective, observational study of 779 new low vision patients at 28 clinic centers in the US. The EQ-5D, Activity Inventory (AI), Telephone Interview for Cognitive Status (TICS), Medical Outcomes Study 36-Item Short-Form Health Survey (SF-36) physical functioning component, and Geriatric Depression Scale (GDS) were administered by telephone interview prior to rehabilitation...
June 2017: Ophthalmic Epidemiology
https://www.readbyqxmd.com/read/27552166/women-with-visual-impairment-and-insured-by-medicaid-or-medicare-are-less-likely-to-receive-recommended-screening-for-breast-and-cervical-cancers
#17
Xinling Xu, Joshua R Mann, Suzanne W McDermott, Chelsea B Deroche, Erin Gustafson, James W Hardin
PURPOSE: To investigate whether women with visual impairment (VI) receive mammography and Pap testing to the same extent as women without VI among the low income population or those aged 65+ years. METHODS: We analyzed the 2000-2010 Medicaid and Medicare data for South Carolina women. Women with VI were identified on the basis of a qualifying diagnosis in billing data. We assessed women's adherence (full adherence, partial adherence and no screening) with two United States Preventive Services Task Force (USPSTF) cancer screening recommendations (mammography and Pap testing) throughout the course of the study period...
June 2017: Ophthalmic Epidemiology
https://www.readbyqxmd.com/read/28139160/the-relation-between-sleep-disruption-and-cataract-in-a-large-population-based-study
#18
Yanjun Chen, David M Nondahl, Carla R Schubert, Barbara E K Klein, Ronald Klein, Karen J Cruickshanks
PURPOSE: To investigate the relation between sleep disruption and nuclear cataract, as well as the impact of cataract removal on sleep, in two discrete population-based cohorts. METHODS: This is a cross-sectional study of 5070 participants from three large longitudinal epidemiologic studies of age-related eye disease, hearing, olfaction, and cognition. Slit-lamp photos of the lens were obtained to grade nuclear cataract using a standardized protocol. The quality of sleep was assessed using a modified Wisconsin Sleep Cohort Study questionnaire...
April 2017: Ophthalmic Epidemiology
https://www.readbyqxmd.com/read/28107088/the-national-eye-survey-of-trinidad-and-tobago-nestt-rationale-objectives-and-methodology
#19
Tasanee Braithwaite, Neville Q Verlander, Debra Bartholomew, Petra Bridgemohan, Kevin McNally, Allana Roach, Subash Sharma, Deo Singh, Konrad Pesudovs, Surujpal Teelucksingh, Christine Carrington, Samuel Ramsewak, Rupert Bourne
PURPOSE: This paper describes the rationale, study design and procedures of the National Eye Survey of Trinidad and Tobago (NESTT). The main objective of this survey is to obtain prevalence estimates of vision impairment and blindness for planning and policy development. METHODS: A population-based, cross-sectional survey was undertaken using random multistage cluster sampling, with probability-proportionate-to-size methods. Eligible participants aged 5 years and older were sampled from the non-institutional population in each of 120 cluster segments...
April 2017: Ophthalmic Epidemiology
https://www.readbyqxmd.com/read/28102752/the-importance-of-conditional-probability-in-diagnostic-reasoning-and-clinical-decision-making-a-primer-for-the-eye-care-practitioner
#20
Paul G Sanfilippo, Alex W Hewitt, David A Mackey
PURPOSE: To outline and detail the importance of conditional probability in clinical decision making and discuss the various diagnostic measures eye care practitioners should be aware of in order to improve the scope of their clinical practice. METHODS: We conducted a review of the importance of conditional probability in diagnostic testing for the eye care practitioner. RESULTS: Eye care practitioners use diagnostic tests on a daily basis to assist in clinical decision making and optimizing patient care and management...
April 2017: Ophthalmic Epidemiology
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