There may be different degrees of vision loss or low vision for people with various eye conditions, based on which The World Health Organization has defined different classifications for low vision i.e.
- Moderate visual impairment or low vision: 20/70 to 20/160
- Severe visual impairment or low vision: 20/200 or worse
- Profound visual impairment, or low vision: 20/500 to 20/100
- Near-total visual impairment or low vision: Less than 20/1000