Assertion: diabetic retinopathy's symptom | /r/HasProperty | obvious
Facets:
Source sentences:
text: Diabetic retinopathy often has no obvious symptoms until major bleeding occurs in the proliferative stage of the disease, causing vision loss.
text: Non-proliferative diabetic retinopathy has no obvious symptoms until the disease progresses to proliferative type and major bleeding in the retina occurs, causing irreversible vision loss.
text: Alone, non-proliferative diabetic retinopathy causes no obvious symptoms or visual loss.