[Asthenopic complaints and ocular convergence at the computer workstation: new test procedures for practice and research].
BACKGROUND
The present paper summarizes a series of ergonomic studies on the relation between asthenopic complaints and binocular vision at the computer workstation. In particular, the paper reports on measurements of the accuracy of ocular convergence during fixation of central fusion stimuli (i. e. fixation disparity) as a function of viewing distance.


METHODS
Different versions of subjective tests for fixation disparity (using dichoptic nonius lines) are presented, including a computer-controlled procedure (the eye-test PC).


RESULTS
These new tests suggest that non-presbyopic subjects with normal binocular vision may suffer from asthenopic complaints if they have - in near vision - an exo fixation disparity larger than average.


CONCLUSIONS
In these cases, the stress exercised on the convergence system can be reduced by using a longer viewing distance at the workplace.
Jaschinski
Wolfgang
W
Institut für Arbeitsphysiologie an der Universität Dortmund, Germany. Jaschinski@ifado.de
D000065:Accommodation, Ocular; D001248:Asthenopia / Q000175:diagnosis*; D016288:Computer Terminals; D003290:Convergence, Ocular; D003626:Data Display; D006804:Ergonomics; D005403:Fixation, Ocular; D006801:Humans; D009784:Occupational Diseases / Q000175:diagnosis*; D015357:Vision Disparity
Asthenopische Beschwerden und die Konvergenz der Augen am Bildschirmarbeitsplatz: Neue Messverfahren für Praxis und Forschung.