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The incorporation of structured light techniques into vision science hasenabled more selective probes of polarization related entoptic phenomena.Diverse sets of stimuli have become accessible in which the spatially dependantoptical properties can be rapidly controlled and manipulated. For example, paststudies with human perception of polarization have dealt with stimuli thatappear to vary azimuthally. This is mainly due to the constraint that thetypically available degree of freedom to manipulate the phase shift of lightrotates the perceived pattern around a person's point of fixation. Here wecreate a structured light stimulus that is perceived to vary purely along theradial direction and test discrimination sensitivity to inwards and outwardsradial motion. This is accomplished by preparing a radial state coupled to anorbital angular momentum state that matches the orientation of the dichroicelements in the macula. The presented methods offering a new dimension ofexploration serve as a direct compliment to previous studies and may providenew insights into characterizing macular pigment density profiles and assessingthe health of the macula.

Psychophysical discrimination of radially varying polarization entoptic phenomena