Combating blinding trachoma.

Potter, Andrew R

doi:10.1136/bmj.307.6898.213

Cited by 5 publications

(5 citation statements)

References 6 publications

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“…Study Reason for exclusion Bailey 1991 The study was an observational study (case-control), thus not a controlled clinical/community trial Esrey 1991 The paper was a 'traditional' review/overview of studies relating to improved water supply and sanitation Potter 1993 The article was an editorial of the BMJ, not a controlled trial…”

Section: Characteristics Of Excluded Studies [Ordered By Study Id]mentioning

confidence: 99%

Environmental sanitary interventions for preventing active trachoma

Rabiu¹,

Alhassan²,

Ejere³

2007

Cochrane Database of Systematic Reviews

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Section: Characteristics Of Excluded Studies [Ordered By Study Id]mentioning

confidence: 99%

Environmental sanitary interventions for preventing active trachoma

Rabiu¹,

Alhassan²,

Ejere³

2007

Cochrane Database of Systematic Reviews

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“…As well, the greater than 20 year period from which studies are drawn may capture temporal trends that are inaccurate reflections of a mean prevalence for 1990. The enormous limitations of a global projection of trachomatous blindness based on an analysis of empirical data help to explain the variability among the estimates found in the literature [4][5][6][7][8].…”

Section: Discussionmentioning

confidence: 99%

“…For example, there is not a single study on the incidence of trachoma blindness and remarkably few on its prevalence. Despite this penury, it is recognized as one of the top 3 or 4 causes of blindness in the world with various claims that the number of persons with bilateral blindness due to trachoma varies from 1 to 9 million [4][5][6][7][8]. Unfortunately, the basis of these figures is not clear, the greatest likelihood being that they represent educated estimates made by trachoma experts.…”

Section: Introductionmentioning

confidence: 85%

“…A sum of the prevalence of blindness and low vision, the global prevalence of trachomatous visual impairment is 0.28/1,000 (lower and upper bounds, 0.15 to 9 0.75/1,000) or 1,480,000 (lower and upper bounds, 793,000 to 3,930,000) affected persons using the 'minimum' approach. Approximately four times this num- ber (6,730,000, lower and upper bounds, 2,780,000 to 22,600,000) is identified with a 'projected' prevalence.…”

Section: Low Visioned and Trachomatous Visual Impairmentmentioning

confidence: 99%

“…It is possible that surveys from a particular area of one country may be as representative as a country-wide survey, however, it was not possible from the literature to identify which studies these might be. 6 …”

Section: Notesmentioning

confidence: 99%

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The global burden of trachomatous visual impairment: I. Assessing prevalence

1995

Int Ophthalmol

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This paper summarizes primary epidemiologic studies of trachomatous blindness to develop age-/sex-/region-specific estimates of the global prevalence of trachomatous blindness and low vision. These studies are first examined for their validity and then employed to derive a 'minimum' prevalence of trachomatous visual impairment. This method yield a global total for 1990 of approximately 640,000 cases of trachomatous blindness, corresponding to a prevalence of 0.12/1,000 (lower and upper bounds, 0.10 to 0.14/1,000). When those with low vision due to trachoma are included, 1.5 million cases of visual impairment are estimated, corresponding to a prevalence of 0.28/1,000 (lower and upper bounds, 0.15 to 0.75/1,000). A second approach, labeled the 'projected' prevalence of trachomatous visual impairment, selects country-wide studies to derive representative regional prevalence values. A global total of 2,899,000 blind ("projected' prevalence of 0.55/1,000 with lower and upper bounds, 0.37 to 0.83/1,000) is estimated for 1990. With trachomatous low vision included, greater than 6.7 million individuals in 1990 have visual impairment from trachoma ("projected' prevalence of 1.28/1,000 with lower and upper bounds, 0.53 to 4.29/1,000). Analysis of the distribution of the global prevalence by age, gender, visual acuity and region provide direction for trachoma research and programme priorities. Attention is drawn to the limited studies and resulting wide variation in the estimates of trachomatous visual impairment prevalence as indicated by the lower and upper bound estimates. It is recommended that this epidemiologic uncertainty be reflected in global and regional estimates of trachomatous visual impairment prevalence in order to draw attention to how little is known and emphasize the need for further surveys. A second paper incorporates these findings in an assessment of the global burden of trachomatous visual impairment.

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