Tangential high-density electrode insertions allow to simultaneously measure neuronal activity across an extended region of the visual field in mouse superior colliculus

•Neuropixels tangential recording gives spatially precise SC optic layer responses.•Simultaneous recording of large neuronal population with ~200 recording sites.•Visual field coverage up to 140° azimuth and 100° elevation.•Optogenetic identification of inhibitory cells over a wide range.