WordNet sense 1 ((often followed by `of') a large number or amount or extent):

batch, deal, flock, heap, lot, mass, mess, mint, peck, pile, plenty, pot, raft, slew, spate, stack, wad, hatful, mickle, muckle, good deal, great deal, quite a little, tidy sum, whole lot, whole slew

WordNet sense 2 (the ability to see; the visual faculty):

vision, visual modality, visual sense

WordNet sense 3 (the range of vision):

ken

WordNet sense 4 (the act of looking or seeing or observing):

survey, view, survey