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Stereoacuity Versus Fixation Disparity as Indicators for Vergence Accuracy Under Prismatic Stress by Miriam Kromeier; Christina Schmitt; Michael Bach; Guntram Kommerell is a Medicine article available to read on EtoBox.

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## Abstract **Background:** Fixation disparity has been widely used as an indicator for vergence accuracy under prismatic stress. However, the targets used for measuring fixation disparity contain artificial features in that the fusional contours are thinned out. We considered that stereoacuity might be a preferable indicator of vergence accuracy, as stereo targets represent natural viewing conditions. **Methods:** We measured fixation disparity with a computer adaptation of Ogle's test and stereoacuity with the automatic Freiburg Stereoacuity Test. Eight subjects were examined under increasing base‐in and base‐out prisms. **Results:** The response of fixation disparity to prismatic stress revealed the curve types described by Ogle and Crone. All eight subjects reached a stereoscopic threshold below 10 arcsec. In seven subjects the stereoscopic threshold increased before double vision occurred. **Conclusion:** Our data suggest that stereoacuity is suitable to assess the range of binocular vision under prismatic stress. As stereoacuity bears the advantage over fixation disparity in that it can be measured without introducing artificial viewing conditions, we suggest exploring whethe

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Author

Miriam Kromeier; Christina Schmitt; Michael Bach; Guntram Kommerell

Publisher

John Wiley and Sons; Wiley (Blackwell Publishing); Blackwell Publishing Inc.; Wiley (ISSN 0275-5408)

Published

2003

Language

EN

Field

Medicine (Health Sciences)