What visual field measurement does the World Health Organization (WHO) cite for severe visual impairment?

A visual field of less than 10 degrees.

While the United States utilizes specific thresholds for administrative purposes, international standards, such as those set by the World Health Organization (WHO), may employ different measures when classifying severe visual impairment. For severe visual impairment, the WHO often cites a visual acuity measurement of less than 3/60. Regarding visual field restriction, the standard cited by the WHO for this severe impairment level is a field restriction of less than 10 degrees. This variation across different nations and international bodies highlights the necessity of clarifying which specific standard—whether national legal definitions or global clinical benchmarks—is being referenced when discussing support systems or public health statistics.