The visual acuity used as cut off for differentiating 'normal' from 'abnormal' children in the School Vision Screening Programme in India is

• A. 06-06-2015 12:00:00 AM
• B. 06-09-2015 12:00:00 AM
• C. 06-12-2015 12:00:00 AM
• D. 01-06-1990 12:00:00 AM