You are legally blind when you have acuity of less than 6/60 in the better-seeing eye. This means that the person sees at six metres what a normal sighted individual will see at 60 metres. With regard to visual fields, if your better-seeing eye has a field of vision less than 20 degrees. If you are legally blind, you may still have some useful vision. Being classified as legally blind enables individuals to qualify for certain government benefits.