Original articleOutcome of Cataract Surgery in Nigeria: Visual Acuity, Autorefraction, and Optimal Intraocular Lens Powers—Results from the Nigeria National Survey
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Materials and Methods
Details of the methods used in the survey have been published.14 A sample size of 15 027 persons aged ≥40 years was calculated on the basis of the target population of 23.6 million people aged ≥40 years (or 17.6% of 133 million total Nigerian population, according to a 2005 projected estimate), a blindness prevalence estimate of 5.0%, an absolute precision level of 0.5% with 95% statistical confidence, and further adjusting for a design effect of 1.75% and 15% for non-response. Multi-stage
Results
A total of 13 591 participants were examined of the 15 122 enumerated, giving a response rate of 89.9%. The response rate ranged from 88.2% to 91.1% in the 6 geopolitical zones. A total of 7031 participants (46.5%) were male, and 77.6% lived in rural areas.
A total of 583 eyes had undergone procedures for cataract, in 299 right eyes and 284 left eyes. A total of 148 right eyes were included in the analysis after excluding couching (129 eyes), trauma (21 eyes), and eyes with missing data on the
Discussion
The findings of this national survey are similar to the findings of many other population-based studies from developing countries (Table 4, available at http://aaojournal.org)23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33 where poor outcomes (using presenting VA) range from 12% in the Philippines to 64% in Cameroon. All studies with disaggregated data demonstrate that IOL surgery gives far better presenting visual acuities than non-IOL surgery: an unknown number of eyes without IOLs may have had
References (33)
- et al.
Global cost-effectiveness of cataract surgery
Ophthalmology
(2007) - et al.
Development of the SRK/T intraocular lens implant power calculation formula
J Cataract Refract Surg
(1990) - et al.
Safety and efficacy of phacoemulsification compared with manual small-incision cataract surgery by a randomized controlled clinical trial: six-week results
Ophthalmology
(2005) - et al.
Rapid assessment of avoidable blindness in Nakuru district, Kenya
Ophthalmology
(2007) - et al.
Cataract surgical coverage and outcome of cataract surgery in a rural district in Malawi
Can J Ophthalmol
(2004) - World Health Organization. Prevention of Blindness and Visual Impairment. Data and Maps: 2006 Cataract Surgical Rate...
- et al.
Cataract blindness—the African perspective
Bull World Health Organ
(2001) - et al.
The surgical management of cataract: barriers, best practices and outcomes
Int Ophthalmol
(2008) Cataracts in India: current situation, access, and barriers to services over time
Ophthalmic Epidemiol
(2007)- et al.
Cataract in Latin America: findings from nine recent surveys
Rev Panam Salud Publica
(2009)
Improving surgical outcomes
Community Eye Health
Cataract surgical coverage and outcome in Goro District, Central Ethiopia
Ethiop Med J
Rapid assessment of avoidable blindness in Western Rwanda: blindness in a postconflict setting
PLoS Med
Prevalence and causes of blindness and visual impairment in Limbe urban area, South West Province, Cameroon
Br J Ophthalmol
Prevalence and causes of blindness and visual impairment in Muyuka: a rural health district in South West Province, Cameroon
Br J Ophthalmol
Cataract blindness and barriers to uptake of cataract surgery in a rural community of northern Nigeria
Br J Ophthalmol
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Manuscript no. 2010-479.
Financial Disclosure(s): The author(s) have no proprietary or commercial interest in any materials discussed in this article.
This study was funded by CBM, Sightsavers International, and Velux Stiftung.
*Group members listed online in Appendix 1 (available at http://aaojournal.org).
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The Nigeria National Blindness and Visual Impairment Study Group is available at http://aaojournal.org.