摘要：SummaryProgressive addition lenses (PALs) are ophthalmic lenses to correct presbyopia by providing improvements of near and far vision in different areas of the lens, but distorting the periphery of the wearer's field of view. Distortion-related difficulties reported by PAL wearers include unnatural self-motion perception. Visual self-motion perception is guided by optic flow, the pattern of retinal motion produced by self-motion. We tested the influence of PAL distortions on optic flow-based heading estimation using a model of heading perception and a virtual reality-based psychophysical experiment. The model predicted changes of heading estimation along a vertical axis, depending on visual field size and gaze direction. Consistent with this prediction, participants experienced upwards deviations of self-motion when gaze through the periphery of the lens was simulated, but not for gaze through the center. We conclude that PALs may lead to illusions of self-motion which could be remedied by a careful gaze strategy.Graphical abstractDisplay OmittedHighlights•Multifocal lenses impair vision of spectacle wearers with gaze-dependent distortions•A model of heading perception from distorted optic flow suggest a misperception•Heading perception was tested with a virtual reality-based simulation of distortions•Distortions lead to gaze direction-dependent illusions in perceived vertical headingNeuroscience; Systems neuroscience; Sensory neuroscience
