@phdthesis{Broschart2010,
  author    = {Michael Broschart},
  title     = {Peripheral Dynamic Stereovision – A Novel Stereoscopic Test},
  journal    = {Peripheres dynamisches Stereosehen - ein neuartiger stereoskopischer Test},
  url       = {https://nbn-resolving.org/urn:nbn:de:gbv:9-000757-7},
  year      = {2010},
  abstract  = {This work proposes and experimentally evaluates a new method and the first prototypic design of an apparatus for the objective assessment of peripheral dynamic stereovision. Peripheral dynamic stereovision is understood as the ability to perceive, recognize and observe moving objects in the visual periphery without sacrificing foveal fixation, i.e. shifting the line of sight (e.g. moving the eyes or the head) and loosing attention to the scene of interest. The presence of stereopsis on top further enhances the perceptive quality by adding the third dimension with judgment of depth and estimation of relative spatial positions as central clues for orientation, coordinative interaction and navigation in space. Based on findings that moving stereoscopic contours can induce distinctive optokinetic reactions, a panoramic stimulus pattern was rotated round subjects’ heads. Designed after the Frisby Stereotest, solely the binocular parallax resulting from the plate thickness carries stereoscopic information, excluding all other depth clues. A specially fitted goggle frame assured correct binocular alignment of the subjects adding objectivity. In first experiments, voluntary reactions (pushing a buzzer button) and involuntarily triggered ocular responses have been registered. The Performance Level (PL) and Confidence Ratio (CR) were introduced as benchmarks for voluntary reactions. Despite larger spreads, the PL averaged at 60 \% while an elevated CR confirmed a low error rate of 16 \% and thus high overall credibility. Poor performance of available recording hard- and software, in many cases, rendered the analysis of involuntary ocular reactions less exhaustive. It was however observable that objects that appear in the periphery of the visual field triggered the onset of nystagmoid search and tracking mechanisms. Finally, mean peripheral locations of subjects’ active reactions have been established at 30 degrees. The outcome of this pilot study in principle confirmed basic feasibility, conceptual validity and practical applicability of this novel method. Prospective fields of application with raised demands on peripheral dynamic stereopsis have been identified and critically assessed. The applicative possibilities and exclusive advantages of this test combining the assessment of stereopsis and dynamic visual field testing have not been matched by solutions published so far. Before however commercialization should be aimed at, design-related issues, including the implementation of electrophysiological ocular measurements, need to be addressed first to lead the post-prototype development to higher diagnostic expressiveness and reliability.},
  language  = {en}
}