ORIGINAL ARTICLE
Year : 2021  |  Volume : 29  |  Issue : 2  |  Page : 101-106

Hospital-Based Assessment of the New Visual Acuity Level in Rapid Assessment of Avoidable Blindness


1 Department of Surgery and Ophthalmology, College of Medicine and Health Sciences, Bingham University, Jos campus, Nigeria
2 Department of Ophthalmology, Jos University Teaching Hospital Jos, Nigeria

Correspondence Address:
Ruth J Alfin
Department of Surgery and Ophthalmology, College of Medicine and Health Sciences, Bingham University, Jos Campus
Nigeria
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/njo.njo_32_20

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Background: There are currently two versions of rapid assessment of avoidable blindness (RAAB) method in use: RAAB5 and RAAB6. While RAAB5 uses visual acuity (VA) of 6/18 as cutoff for visual impairment (VI), RAAB6 uses VA of 6/12. Aim: The aim of the study was to determine the average additional time it will take to test from 6/18 to 6/12 VA levels and to compare the causes of VI across these VA cutoffs. Methods: It was a cross-sectional study of patients aged 50 years and above attending a tertiary hospital in Jos between April and September 2016 (6 months). RAAB6 methodology was used to test presenting VA of all participants. The time taken to obtain a VA of 6/18 and to test from 6/18 to 6/12 was recorded separately for each eye. Those with VA worse than 6/12 in one or both eyes had their eyes examined to determine the cause of VI. The data collected were analyzed using the Statistical Package for Social Sciences for windows software, version 20. Results: The average additional time taken to test VA from 6/18 to 6/12 was 42.11 seconds (95% confidence interval: 32.86–51.35). Cataract was the major cause of VI with both VA cutoffs with no significant difference in its proportion (P = 0.924). Uncorrected refractive error and glaucoma were the next important causes of VI with 6/12 (P = 0.041) and 6/18 (P = 0.041) cutoffs, respectively. Conclusion: The spectrum of disease causing VI may not differ significantly between the two RAAB versions, but survey duration will likely be prolonged with RAAB6.


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