Human-Computer Interaction: Ergonomics and User Interfaces - Vol. 1

By Hans-Jörg Bullinger; Jürgen Ziegler | Go to book overview

stereo vision using the TNO-test and the CBSS showed no significant difference after applying the Wilcoxon Ranking test (p=0.72). Further details can be taken from Hoffmann ( Hoffmann and Menozzi 1999b).


4.5
Phoria

Applying anaglyphs to the assessment of phoria was possible after adjusting the colors of each stimulus. Comparing the results of & pool of subject after assessing phoria using the Titmus Vision Screener and the CBSS showed no significant difference after applying the Wilcoxon Ranking test (p=0.6). Further details can be taken from Hoffmann ( 1998).


5
Discussion and Conclusions

The respondents to the questionnaire established visual examinations due to G37 in Germany as the current used procedure to test the human visual system. The respondents established as well, that the current procedure is resource intense. The visual tests defined in G 37 were applied to a CBSS and each test was examined concerning technical restrictions arose by using VDUs to present visual stimuli. The evaluated technical restrictions were overcome. Experimental validation showed that using the CBSS to examine the human visual system due to G 37 leads to reliable results despite technical restrictions. That showed the self-screening approach to assess visual performance to be valid.

The approach of applying human visual test to a CBSS reduces the resources involved in the screening process. The number of tests can be extended not only covering the tests defined in G37. Work within the CBSS project started to apply test for visual search tasks, constrast sensitivity, tracking and human audio performance.


6
References

Hoffmann, A. & Menozzi, M. ( 1997), "Using a high resolution display for screening visual acuity for near vision", Displays, 18( 1), 11-20.

Hoffmann, A. ( 1998), Computer-based screening of the visual system, ETH Zurich, PhD. Thesis, Diss Nr. 12781.

Hoffmann, A. & Menozzi M. ( 1999a), "Applying anaglyphs for the assessment of stereopsis to a PC-based screening system", Displays, 20( 1), 31-38.

Hoffmann, A. & Menozzi M. ( 1999b), "Applying the Ishihara test to a PC-based screening system", Displays, 20( 1), 39-47.

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