Recently diagnosed with SLE. Butterfly rash has come and gone for years,my husband tells the doc. Noticed mouth sores,foaming urine,changes in vision a few months ago. Have had moderate neuropathy feet and legs for a few years. Few months ago, increased pain to intolerant level. Not treated yet. Plaquenil is the treatment being floated.. I also have proriasis,very mild,1-2 lesions every few months. Worried about plaquenil,adverse reaction. Especially the eye thing. What is the incidence of blindness?