A method for assessing the function of at least one sensory field of a subject,and apparatus and systems for carrying out the method, the method comprising:using a display, presenting stimuli to selected locations of the sensory field,the selected locations being centred at points on a sampling grid spanning a portionof the sensory field, wherein the individual stimuli if presented simultaneouslyat the sampling grid points would overlap in the space defined by the sensory dimensionsof the field using a sensor, detecting responses in the subjects sensoryfield evoked by the stimuli and processing the detected responses to relatethem to the function of the subjects sensory field at the selected locations.
