Assertion: diabetic retinopathy's stage | /r/HasProperty | based upon absence
Facets:
Source sentences:
text: Non-proliferative retinopathy can be classified into mild, moderate or severe stages based upon the presence or absence of retinal bleeding, abnormal venous beading of the vessel wall (venous beading) or abnormal vascular findings (intraretinal microvascular anomalies or IRMA).