R Lower quadrantanopia = C/L Parietal Lesion/MCA via Dorsal optic radiation.
If top quarter was gone, then it would be C/L temporal lesion via meyer loop.
lroew tnraoaiuqnaadp: eraiptal elsnio
vs eppru anquaptdaaonri = tpoalerm eiolsn
heres how I remember this: Temporal lesions are on Top, so parietal lesions are below. and always remember the visual field and the side of lesion are the opposite sides.