<unk>   is the absence of<unk>  where it existed before, which can happen either acutely (i.e. abruptly) or chronically (i.e. over a long period of time). It may be caused by media opacities, retinal disease, optic nerve disease, visual pathway disorders, or functional disorders, or it may be due to an abnormality in the central nervous system.
Vision loss
Oliguria
Dysuria
Anuria
Muscle weakness
Polyuria
Urinary urgency
Blurred vision