The purpose of this research was to assess the perspectives of using contact lens with implanted occluder (CL + O) for
far peripheral vision investigation. Contact lens with sufficiently large artificial opaqueness at the center seems to
be a proper tool for separation of peripheral visual mechanisms since it prevents any possibility of test stimulus
foveating. Earlier studies with similar contact lenses were aimed to mimic vision loss in the case of macular
degeneration by means of creating artificial scotoma with relatively small occluders which only “switched off” foveal
area and near periphery from visual perception. The task of our study was to separate far peripheral vision using
significantly larger occluders in order to provide a possibility to investigate peripheral visual capabilities in
natural visual conditions without gaze fixation and division of attention. The calculations based on geometrical optics
analysis taking into account the quantitative data available in literature on the human eye structure were used for
assessment of the blind zone size created with a given occluder in various experimental conditions in view of proper CL
+ O choice for experimental sessions. The experimental part of the work included measurements of the blind zone size and
position in the visual field varying the occluder diameter and ambient illumination (to change the pupil size). It has
been concluded that CL + O is promising for peripheral vision investigations, however, application of CL + O requires
thorough control of experimental conditions because the occluded retinal area essentially depends on the individual eye
optics and illumination of the experimental scene.
peripheral vision, vision without fovea, contact lens, implanted occluder, calculation of blind area
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