A PRELIMINARY REPORT ON THE DESIGN, PREPARATION, AND STANDARDIZATION OF A VISION SCREENER “E” CHART

Abstract

To facilitate a comprehensive whole population visual acuity screening, a 1-meter vision screener “E” chart was prepared to be used in the person-by-person household visual acuity examination by non-expert health workers. The chart is designed to be used in measuring visual acuity from a distance of one meter. The scaling is in terms of-log MAR (logarithm of minimum angle of resolution) with a linear progression from a value of zero to one. It is just used in the study of the Visual Disorders Project as part of the WHO/PBL prevention of blindness program in the city of Baft (Kerman province - Iran) and proved to be efficient. The initial standardization showed a sensitivity of 100% and a specificity of more than 56% with 27% false positive results as compared to classic 6-meter Senlien chart.

Keywords

• Visual acuity
• “E” chart
• Methodology