A Population-based survey of the prevalence and types of glaucoma in Nigeria: results from the Nigeria National Blindness and Visual Impairment Survey

Kyari, Fatima; Entekume, Gabriel; Rabiu, Mansur Muhammad; Spry, Paul G.; Wormald, Richard; Nolan, Winifred; Murthy, Gudlavalleti Venkata Satyanarayana; Gilbert, Clare

doi:10.1186/s12886-015-0160-6

Cited by 92 publications

(108 citation statements)

References 55 publications

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“…The Baltimore Eye Survey (9) found that the relative risk of having glaucoma is increased 3.7-fold for individual who have a sibling with primary open-angle glaucoma compared to an individual who has a parent with primary open angle glaucoma that has a 2.2-fold risk of developing glaucoma. It is obvious from our study like the other studies (5,14,20) that the prevalence of primary open-angle glaucoma is higher amongst first degree relatives than the general populations (2,4,7,8,10) . Therefore, every effort should be directed at getting this high-risk population screened for the disease.…”

Section: Discussionsupporting

confidence: 60%

“…The Nigeria Blindness Survey has shown that most of the over 1.2 million adults with glaucoma are not aware that they have the disease (3,4) . It is critical to note that symptoms occur late in Primary open angle glaucoma (POAG).…”

Section: Discussionmentioning

confidence: 99%

“…In Nigeria, poor knowledge of glaucoma has been identified as a major factor associated with late presentation of glaucoma patients (18,19) . A robust population-based study in Nigeria showed that the prevalence of glaucoma was 5.02% with 86% of it being the open angle (4) . Our study clearly shows a higher prevalence of glaucoma amongst these first-degree relatives compares to the general population.…”

Section: Discussionmentioning

confidence: 99%

“…By the year 2020, it has been predicted that those with glaucoma would climb to 79.6 million and with an estimated 11 million persons bilaterally blind globally (2) . The Nigeria National blindness and Visual Impairment Survey showed that estimated 1.2 million Nigerians aged ≥40 years have glaucoma (3) and account for 16.7% of all cases of blindness in Nigeria (4) . Screening for glaucoma is an important tool for reducing the incidence of blindness and visual impairment.…”

Section: Introductionmentioning

confidence: 99%

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Opportunistic Screening for Glaucoma Amongst Glaucoma Patients’ First Degree Relatives who Accompanied them to Glaucoma Clinic

Nathaniel

Awoyesuku²

2017

IAM

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Aim: To identify people with glaucoma and glaucoma suspect amongst first degree relatives accompanying their glaucoma patient relatives to the Glaucoma clinic, University of Port Harcourt Teaching Hospital, Port Harcourt. Materials and methods: It was a prospective population-based study of first-degree relatives of Primary open-angle glaucoma patients who accompanied them to the glaucoma clinic. All participating individuals underwent comprehensive eye examination including vision screening, refraction, slit lamp biomicroscopy, applanation tonometry, gonioscopy and dilated fundus examination. Persons with definite and suspected glaucoma were subjected to threshold standard automated perimetry. Results: A total of 95 individuals who were first-degree relatives of 41 patients with Primary open angle glaucoma were examined. Fifty-seven of them (60%) were males, and 38 (40%) were females, with a mean age of 37.71± 8.15 years. Eighty-three (87.37%) were offspring and 12 (12.63%) siblings. Eighteen (18.9%) were observed to have definite Primary open angle glaucoma; 7 (7.4%) of them had been previously diagnosed. Another 16 (16.8%) of the relatives were found to be Glaucoma suspect. Twelve (66.7%) of those with glaucoma were males while 6 (33.3%) were females;13 (72.2%) were offspring while 5 (27.8%) were siblings.Prevalence of primary open angle glaucoma was 13.7% for offspring and 5.3% for siblings. Conclusion: Prevalence of primary open angle glaucoma amongst first degree relatives of glaucoma patients is higher than the general population. Targeted screening of at-risk group will help in early detection and treatment.

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Section: Discussionsupporting

confidence: 60%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Opportunistic Screening for Glaucoma Amongst Glaucoma Patients’ First Degree Relatives who Accompanied them to Glaucoma Clinic

Nathaniel

Awoyesuku²

2017

IAM

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“…4 The glaucoma-defining VCDR values for the 97.5 th (0.7) and 99.5 th (0.75) percentiles in the study population 5 were applied, reporting a glaucoma prevalence of 5.02% (95%CI 4.60-5.47) among adults aged 40-years old and above. 6 The i-VCDR grading by Moorfields Eye Hospital…”

Section: Introductionmentioning

confidence: 99%

Agreement in Measurement of Optic Cup-to-Disc Ratio with Stereo Biomicroscope Funduscopy and Digital Image Analysis: Results from the Nigeria National Blindness and Visual Impairment Survey

Kyari

Gilbert

2016

Ophthalmic Epidemiology

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AcknowledgementTunde Peto, Ferenc Sallo and Nisha Parmar of the MEHRC for grading the optic disc images. Previous presentationThe findings in this paper have been previously presented, in part, at the 23rd ISGEO Congress, London, United Kingdom. September, 2014.This submission has not been published anywhere previously and it is not simultaneously being considered for any other publication. 3 Abstract Purpose:To determine agreement of estimations of vertical cup-to-disc ratios (VCDR) between clinical stereo-biomicroscopic funduscopy and digital fundus images analysis. Methods:Systematic sampling of 1-in-7 from a sample of 13,591 participants aged >40 years gave a subsample who were examined in detail. VCDR was estimated clinically by 60D aspheric lens biomicroscopic funduscopy (c-VCDR) and by fundus images (i-VCDR) graded at Moorfields Eye Hospital Reading Centre.Spearman's correlation coefficient, paired t-test and Bland-Altman method to assess limits of agreement (LOA) between the two methods were applied. Results:Of 1759 participants in the subsample, 848 participants (48%) who had normal

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Prevalence and Causes of Visual Loss Among the Indigenous Peoples of the World

et al. 2018

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IMPORTANCEStudies have documented a higher disease burden in indigenous compared with nonindigenous populations, but no global data on the epidemiology of visual loss in indigenous peoples are available. A systematic review of literature on visual loss in the world's indigenous populations could identify major gaps and inform interventions to reduce their burden of visual loss.OBJECTIVE To conduct a systematic review on the prevalence and causes of visual loss among the world's indigenous populations.EVIDENCE REVIEW A search of databases and alternative sources identified literature on the prevalence and causes of visual loss (visual impairment and blindness) and eye diseases in indigenous populations. Studies from January 1, 1990, through August 1, 2017, that included clinical eye examinations of indigenous participants and, where possible, compared findings with those of nonindigenous populations were included. Methodologic quality of studies was evaluated to reveal gaps in the literature.FINDINGS Limited data were available worldwide. A total of 85 articles described 64 unique studies from 24 countries that examined 79 598 unique indigenous participants. Nineteen studies reported comparator data on 42 085 nonindigenous individuals. The prevalence of visual loss was reported in 13 countries, with visual impairment ranging from 0.6% in indigenous Australian children to 48.5% in native Tibetans 50 years or older. Uncorrected refractive error was the main cause of visual impairment (21.0%-65.1%) in 5 of 6 studies that measured presenting visual acuity. Cataract was the main cause of visual impairment in all 6 studies measuring best-corrected acuity (25.4%-72.2%). Cataract was the leading cause of blindness in 13 studies (32.0%-79.2%), followed by uncorrected refractive error in 2 studies (33.0% and 35.8%).CONCLUSIONS AND RELEVANCE Most countries with indigenous peoples do not have data on the burden of visual loss in these populations. Although existing studies vary in methodologic quality and reliability, they suggest that most visual loss in indigenous populations is avoidable. Improvements in quality and frequency of research into the eye health of indigenous communities appear to be required, and coordinated eye care programs should be implemented to specifically target the indigenous peoples of the world.

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A Population-based survey of the prevalence and types of glaucoma in Nigeria: results from the Nigeria National Blindness and Visual Impairment Survey

Cited by 92 publications

References 55 publications

Opportunistic Screening for Glaucoma Amongst Glaucoma Patients’ First Degree Relatives who Accompanied them to Glaucoma Clinic

Opportunistic Screening for Glaucoma Amongst Glaucoma Patients’ First Degree Relatives who Accompanied them to Glaucoma Clinic

Agreement in Measurement of Optic Cup-to-Disc Ratio with Stereo Biomicroscope Funduscopy and Digital Image Analysis: Results from the Nigeria National Blindness and Visual Impairment Survey

Prevalence and Causes of Visual Loss Among the Indigenous Peoples of the World

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