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[Computer-based determination of stereopsis]
1Eidgenössische Technische Hochschule Zürich. hoffmann@iha.bepr.ethz.ch
Aim:
A computer-based approach to assess stereopsis for screening purposes is described. This approach is based on random-dot stereograms (RDS).
Method:
The TNO test is a common method to assess stereopsis based on red/green anaglyphs and the use of RDS. This technique was transferred to a computer-based platform. To investigate the validity of the computer-based approach, 25 subjects were tested with both the TNO test and the computer-based approach.
Results:
With regard to the spectral emission of the monitor screen, accurate separation of red and green for RDS generation was not possible. However, adaptation of the RDS to the colour filters used permitted the best-possible separation. The resolution of the monitor required a viewing distance of 2 m. The results obtained showed no significant differences between the two methods.
Conclusions:
For the computer-based screening, RDS and anaglyphs can be employed. The influence of the spectral emission of the monitor screen and its resolution can be reduced by adapting the RDS colours to the filters used and modifying the viewing distance.