Level of visual impairment | Category of vision | Visual acuity in better eye with optical correction | ||
---|---|---|---|---|
Slight if visual acuity < 6/7.5 | Normal vision | 6/18 or better | ||
Visual impairment | Low vision | < 6/18 to 6/60 | ||
Severe visual impairment | Low vision | < 6/60 to 3/60 | ||
Blind | Blindness | < 3/60 to no light perception | ||
or | ||||
Visual field ⩽ 10 degrees around central fixation |