83%

I don't know hoe it works in other countries, but in Portugal you can have a "degree of disability" when you are born, or acquired, some kind of incapacity.

Isabel has a 83% degree of disability for her visual impairment. 6/500 visual acuity in a single eye

It is what it is. This is only important for taxes purpuses. And I can tell you that the nassociantion of low vision in children said Isabel was a "visual" child. That she was fine, and uses all her vision, no matter how low it is.

Now we have to stimulate her