Cargando…
The epidemiology of low vision and blindness associated with trichiasis in southern Sudan
BACKGROUND: We investigated vision status associated with trachomatous trichiasis (TT) and explored age-sex patterns of low vision and blindness associated with trichiasis in Mankien district of southern Sudan where trachoma prevention and trichiasis surgery were absent. METHODS: A population based...
Autores principales: | , , , , , , , , |
---|---|
Formato: | Texto |
Lenguaje: | English |
Publicado: |
BioMed Central
2007
|
Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2077329/ https://www.ncbi.nlm.nih.gov/pubmed/17725828 http://dx.doi.org/10.1186/1471-2415-7-12 |
_version_ | 1782138111346606080 |
---|---|
author | Ngondi, Jeremiah Reacher, Mark Matthews, Fiona Ole-Sempele, Francis Onsarigo, Alice Matende, Ibrahim Baba, Samson Brayne, Carol Emerson, Paul |
author_facet | Ngondi, Jeremiah Reacher, Mark Matthews, Fiona Ole-Sempele, Francis Onsarigo, Alice Matende, Ibrahim Baba, Samson Brayne, Carol Emerson, Paul |
author_sort | Ngondi, Jeremiah |
collection | PubMed |
description | BACKGROUND: We investigated vision status associated with trachomatous trichiasis (TT) and explored age-sex patterns of low vision and blindness associated with trichiasis in Mankien district of southern Sudan where trachoma prevention and trichiasis surgery were absent. METHODS: A population based survey was undertaken and eligible persons underwent eye examination. Visual acuity (VA) was tested using Snellen E chart and persons with TT identified. Vision status was defined using the WHO categories of visual impairment based on presenting VA: normal vision (VA ≥ 6/18 in better eye); low vision (VA < 6/18 but ≥ 3/60 in better eye); and blindness (VA < 3/60 in better eye). An ordinal logistic regression model was fitted and age/sex specific distribution of vision status predicted. RESULTS: Overall 341/3,567 persons examined had any TT. Analysis was based on 319 persons, 22 persons were excluded: 20 had both TT and cataract; and 2 had missing VA data. Of the 319 persons: 158(49.5%) had trichiasis-related corneal opacity (CO); bilateral TT and bilateral CO were found in 251(78.7%) and 110 (34.5%), respectively; 146 (45.8%) had low vision or blindness; the ratio of low vision to blindness was 3.2:1; and no sex differences were observed. In our model the predicted distribution of vision status was: normal vision, 53.9% (95% CI 50.9–56.9); low vision, 35.3% (95% CI 33.3–37.2); and blindness, 10.9% (95% CI 9.7–12.0). CONCLUSION: We have reported severe trichiasis and high prevalence of vision loss among persons with trichiasis. Our survey showed that almost 1 in 20 of the entire population suffered low vision or blindness associated with trachoma. The need for trichiasis surgery, trachoma prevention services, and rehabilitation of the blind is acute. |
format | Text |
id | pubmed-2077329 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2007 |
publisher | BioMed Central |
record_format | MEDLINE/PubMed |
spelling | pubmed-20773292007-11-14 The epidemiology of low vision and blindness associated with trichiasis in southern Sudan Ngondi, Jeremiah Reacher, Mark Matthews, Fiona Ole-Sempele, Francis Onsarigo, Alice Matende, Ibrahim Baba, Samson Brayne, Carol Emerson, Paul BMC Ophthalmol Research Article BACKGROUND: We investigated vision status associated with trachomatous trichiasis (TT) and explored age-sex patterns of low vision and blindness associated with trichiasis in Mankien district of southern Sudan where trachoma prevention and trichiasis surgery were absent. METHODS: A population based survey was undertaken and eligible persons underwent eye examination. Visual acuity (VA) was tested using Snellen E chart and persons with TT identified. Vision status was defined using the WHO categories of visual impairment based on presenting VA: normal vision (VA ≥ 6/18 in better eye); low vision (VA < 6/18 but ≥ 3/60 in better eye); and blindness (VA < 3/60 in better eye). An ordinal logistic regression model was fitted and age/sex specific distribution of vision status predicted. RESULTS: Overall 341/3,567 persons examined had any TT. Analysis was based on 319 persons, 22 persons were excluded: 20 had both TT and cataract; and 2 had missing VA data. Of the 319 persons: 158(49.5%) had trichiasis-related corneal opacity (CO); bilateral TT and bilateral CO were found in 251(78.7%) and 110 (34.5%), respectively; 146 (45.8%) had low vision or blindness; the ratio of low vision to blindness was 3.2:1; and no sex differences were observed. In our model the predicted distribution of vision status was: normal vision, 53.9% (95% CI 50.9–56.9); low vision, 35.3% (95% CI 33.3–37.2); and blindness, 10.9% (95% CI 9.7–12.0). CONCLUSION: We have reported severe trichiasis and high prevalence of vision loss among persons with trichiasis. Our survey showed that almost 1 in 20 of the entire population suffered low vision or blindness associated with trachoma. The need for trichiasis surgery, trachoma prevention services, and rehabilitation of the blind is acute. BioMed Central 2007-08-28 /pmc/articles/PMC2077329/ /pubmed/17725828 http://dx.doi.org/10.1186/1471-2415-7-12 Text en Copyright © 2007 Ngondi et al; licensee BioMed Central Ltd. http://creativecommons.org/licenses/by/2.0 This is an Open Access article distributed under the terms of the Creative Commons Attribution License ( (http://creativecommons.org/licenses/by/2.0) ), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. |
spellingShingle | Research Article Ngondi, Jeremiah Reacher, Mark Matthews, Fiona Ole-Sempele, Francis Onsarigo, Alice Matende, Ibrahim Baba, Samson Brayne, Carol Emerson, Paul The epidemiology of low vision and blindness associated with trichiasis in southern Sudan |
title | The epidemiology of low vision and blindness associated with trichiasis in southern Sudan |
title_full | The epidemiology of low vision and blindness associated with trichiasis in southern Sudan |
title_fullStr | The epidemiology of low vision and blindness associated with trichiasis in southern Sudan |
title_full_unstemmed | The epidemiology of low vision and blindness associated with trichiasis in southern Sudan |
title_short | The epidemiology of low vision and blindness associated with trichiasis in southern Sudan |
title_sort | epidemiology of low vision and blindness associated with trichiasis in southern sudan |
topic | Research Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2077329/ https://www.ncbi.nlm.nih.gov/pubmed/17725828 http://dx.doi.org/10.1186/1471-2415-7-12 |
work_keys_str_mv | AT ngondijeremiah theepidemiologyoflowvisionandblindnessassociatedwithtrichiasisinsouthernsudan AT reachermark theepidemiologyoflowvisionandblindnessassociatedwithtrichiasisinsouthernsudan AT matthewsfiona theepidemiologyoflowvisionandblindnessassociatedwithtrichiasisinsouthernsudan AT olesempelefrancis theepidemiologyoflowvisionandblindnessassociatedwithtrichiasisinsouthernsudan AT onsarigoalice theepidemiologyoflowvisionandblindnessassociatedwithtrichiasisinsouthernsudan AT matendeibrahim theepidemiologyoflowvisionandblindnessassociatedwithtrichiasisinsouthernsudan AT babasamson theepidemiologyoflowvisionandblindnessassociatedwithtrichiasisinsouthernsudan AT braynecarol theepidemiologyoflowvisionandblindnessassociatedwithtrichiasisinsouthernsudan AT emersonpaul theepidemiologyoflowvisionandblindnessassociatedwithtrichiasisinsouthernsudan AT ngondijeremiah epidemiologyoflowvisionandblindnessassociatedwithtrichiasisinsouthernsudan AT reachermark epidemiologyoflowvisionandblindnessassociatedwithtrichiasisinsouthernsudan AT matthewsfiona epidemiologyoflowvisionandblindnessassociatedwithtrichiasisinsouthernsudan AT olesempelefrancis epidemiologyoflowvisionandblindnessassociatedwithtrichiasisinsouthernsudan AT onsarigoalice epidemiologyoflowvisionandblindnessassociatedwithtrichiasisinsouthernsudan AT matendeibrahim epidemiologyoflowvisionandblindnessassociatedwithtrichiasisinsouthernsudan AT babasamson epidemiologyoflowvisionandblindnessassociatedwithtrichiasisinsouthernsudan AT braynecarol epidemiologyoflowvisionandblindnessassociatedwithtrichiasisinsouthernsudan AT emersonpaul epidemiologyoflowvisionandblindnessassociatedwithtrichiasisinsouthernsudan |