Applying anaglyphs for the assessment of stereopsis to a PC-based screening system
Aim: In this study a computer-based approach using random-dot stereograms (RDS) to assess stereopsis is presented for screening applications. Method: The TNO-test is a common method to assess stereopsis using anaglyphic RDS. This technique was transferred to computer-based use. The efficiency of the computer-based approach was analysed by testing 25 subjects for stereopsis using the computer-based approach and the TNO-test. Results: The generation of RDS did not allow an exact separation when using colour filters, regarding the spectral emission of the monitor. An adjustment of the RDS colours to the available colour filters and the spectral emission of the monitor allowed a sufficient separation. The resolution of the monitor required a viewing distance of 2m. The results from testing the subjects did not produce a significant difference between the methods. Conclusions: A computer-based assessment of stereopsis could use analgyphic methods. The influence of the spectral emission of a monitor with cathode ray tubes and its resolution can be ignored after an optimisation of the colours to generate the RDS and an increased viewing distance for the computer-based use.
stereopsis binocular vision computer-based screening