Development and Validation of the Minnesota Low Vision Reading Test (MNRead) Acuity Chart for the Asante Twi Language.

Samuel Bert Boadi-Kusi,Emmanuel Asubonteng,Michael Agyemang Kwarteng

doi:10.4314/ahs.v19i4.15

Samuel Bert Boadi-Kusi, Emmanuel Asubonteng + Show 1 more

Open Access

https://doi.org/10.4314/ahs.v19i4.15

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Abstract

To design and validate a MNREAD Asante Twi version reading chart, to aid in the assessment of near visual acuity of natives Ghanaians. Cross-sectional and experimental designs were employed in phases I and II respectively of this study. The chart was developed using 20 transited pupils in class four in the Kumasi metropolis in phase I and validated in a clinical setting at the Manhyia District Hospital, Kumasi, using students in phase II. A total of 100 participants (mean age; 22.19 ± 1.61 years) were involved in the second phase of this study. A Pearson product-moment correlation coefficient was computed to assess the relationship between MNREAD Asante Twi charts logMAR scores in both eyes. The MNREAD-Asante Twi acuity charts had very strong correlations (r = 0.94, p < 0.001) for MNREAD set 1A (black on white background) scores and MNREAD set 2A (black on white background) for acuity scores. Correlation between MNREAD set 1B (white on black background) scores and MNREAD set 2B (white on black background) scores was r = 0.95, p < 0.001. MNREAD Asante Twi reading chart will enhance the measurement of near visual function in native Ghanaians.

Highlights

In the assessment of near visual acuity, measurements based on a single optotype are not adequate indicators of reading performance because the reading function is a highly complex ability apart from good acuity
MNREAD Asante Twi reading chart will enhance the measurement of near visual function in native Ghanaians
Sentences were constructed for the design of the MNREAD Asante Twi charts

Summary

Introduction

In the assessment of near visual acuity, measurements based on a single optotype are not adequate indicators of reading performance because the reading function is a highly complex ability apart from good acuity. The MNREAD Acuity charts are continuous-text reading-acuity charts which have been developed over the years for assessing the reading acuity and reading speed of normal and low-vision patients.[2] The first of its kind was developed by Legge and his colleagues[2] at the Minnesota Low-Vision Centre using short sentences.[2,3] They are designed to measure reading acuity, critical print size, and maximum reading speed They are reliably used in clinical applications and in scientific research. The concepts of standard-length words and 60-character sentence have been adapted in the scoring of the MNREAD charts to minimize differences in scoring.[1,2,3,5,6,7] Charts include 19 logarithmic sentences in the logMAR range of –0.5 to 1.3, with 0.1 logarithmic intervals These concepts and the design make the MNREAD charts preferred for the visual assessment of normal and low vision patients. MNREAD charts show the equivalent Snellen and M values, in addition to logMAR.[1,2,3,5,6,7] Ghana has an illiterate population of about 38.3% of its total population of 28,308,301.8 The assessment of near

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