Volume 34 #2

Contents

1. Assessment of visual sensations of color changes on chronic pain patients during empatho-technique sessions
2. CONTACT LENS WITH IMPLANTED OCCLUDER AS A TOOL FOR ASSESSMENT OF FAR PERIPHERAL VISION IN NATURAL VIEWING CONDITIONS
3. Psychoacoustic and electrophysiological parameters in patients after cochlear implantation
4. Threshold loudness’ changes for the first and last pulse in sequence in listeners with normal hearing and hearing losуs
5. Maximal directions discrepancy as accuracy criterion of images projective normalization for optical text recognition
6. CT-images correction method for binarization quality improvement
7. Study of impact of X-Ray imagery nature on keypoints detection and description quality

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.

Key words: peripheral vision, vision without fovea, contact lens, implanted occluder, calculation of blind area

DOI: 10.31857/S0235009220020043

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