A method for assessing the visual sensory system of a subject, the method comprising the steps of: presenting, using at least one display, multifocal stimuli in groups of concurrently presented individual visual stimuli in a plurality of presentation cycles, each presentation cycle including a sequence of time steps at which groups of individual visual stimuli are presented, each group of concurrently presented individual visual stimuli only including visual stimuli from one single clustered stimulus ensemble of at least two clustered stimulus ensembles that are adapted to evoke pupillary responses from at least one pupil of the subject, the one single clustered stimulus ensemble being exchanged in the sequence of time steps, each clustered stimulus ensemble comprising a plurality of individual visual stimuli that can be presented to stimulus regions included in a portion of a visual field of the subject for the clustered stimulus ensemble, presented individual visual stimuli being concurrently presented according to statistically independent sequences such that, on any time step that a group of individual visual stimuli are presented from a given clustered stimulus ensemble, each of the individual visual stimuli included in the given clustered stimulus ensemble has a probability of being presented of 0.5 ± 30%; detecting, using a device for detecting the evoked pupillary responses, said pupillary responses; using a processor, recording and relating the detected pupillary responses to the individual visual stimuli of the clustered stimulus ensembles that evoked the pupillary responses; and using a processor, determining weighting functions of the pupillary responses for each stimulus region of the visual field tested from an analysis of the recorded pupillary responses. presenting, using at least one display, multifocal stimuli in groups of concurrently presented individual visual stimuli in a plurality of presentation cycles, each presentation cycle including a sequence of time steps at which groups of individual visual stimuli are presented, each group of concurrently presented individual visual stimuli only including visual stimuli from one single clustered stimulus ensemble of at least two clustered stimulus ensembles that are adapted to evoke pupillary responses from at least one pupil of the subject, the one single clustered stimulus ensemble being exchanged in the sequence of time steps, each clustered stimulus ensemble comprising a plurality of individual visual stimuli that can be presented to stimulus regions included in a portion of a visual field of the subject for the clustered stimulus ensemble, presented individual visual stimuli being concurrently presented according to statistically independent sequences such that, on any time step that a group of individual visual stimuli are presented from a given clustered stimulus ensemble, each of the individual visual stimuli included in the given clustered stimulus ensemble has a probability of being presented of 0.5 ± 30%; detecting, using a device for detecting the evoked pupillary responses, said pupillary responses; using a processor, recording and relating the detected pupillary responses to the individual visual stimuli of the clustered stimulus ensembles that evoked the pupillary responses; and using a processor, determining weighting functions of the pupillary responses for each stimulus region of the visual field tested from an analysis of the recorded pupillary responses.