Vision in Behçet's disease is usually lost in an average of 3.36 years after onset of eye symptoms. These data may be helpful in assessing the effectiveness of any treatment used.
Mamo JG. The Rate of Visual Loss in Behçet's Disease. Arch Ophthalmol. 1970;84(4):451-452. doi:10.1001/archopht.1970.00990040453009