A method for assessing the function of at least one sensory field of asubject, and apparatus and systems for carryingout the method, the method comprising: using a display, presenting stimuli toselected locations of the sensory field, the selectedlocations being centred at points on a sampling grid spanning a portion of thesensory field, wherein the individual stimuli if presentedsimultaneously at the sampling grid points would overlap in the space definedby the sensory dimensions of the field using a sensor,detecting responses in the subjects sensory field evoked by the stimuli andprocessing the detected responses to relate them to thefunction of the subjects sensory field at the selected locations.
