Zhang XJ, Leung CKS, Li EY, et al. - In this population-based diagnostic accuracy study involving 2,145 patients (aged 50 years and older), researchers assessed the diagnostic precision of Rapid Assessment of Avoidable Blindness (RAAB). They included candidates who partook in the RAAB survey. All recruited participants underwent ophthalmic examination in accordance with the RAAB protocol and were then re-examined on the same day with instruments in a mobile eye clinic located in a village center. Examination in the mobile clinic involved standardized visual acuity (VA) tests utilizing logarithm of the minimum angle resolution charts, refraction, slit-lamp biomicroscopy, and dilated fundal examination with a binocular indirect ophthalmoscope. One thousand eight hundred sixteen patients [mean (±standard deviation) age was 64.4 ± 9.6 years], involving 686 men and 1,130 women, had ophthalmic examination in the mobile eye clinic. For identifying the prevalence of blindness, visual impairment (VI; defined as VA ＜ 6/18 in the better eye), and VI due to cataract, the diagnostic performances of RAAB were high.