a preliminary report on the design, preparation, and standardization of a vision screener “e” chart

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.