White Rose University Consortium logo
University of Leeds logo University of Sheffield logo York University logo

Prism vergence measurements following adaptation to a base out prism

Tuff, L.C., Firth, A.Y. and Griffiths, H.J. (2000) Prism vergence measurements following adaptation to a base out prism. British Orthoptic Journal, 57. pp. 42-44. ISSN 0068-2314


Download (652Kb)


This study examines the effect of adaptation on the prism vergence range following an induced deviation. Five young adult subjects, with normal binocular functions, underwent fusional verfence testing to base in prisms before and after wearing a 10(Δ) base out Fresnel prism. The Fresnel prism was worn for a period of 2, 5, or 10 min on each of three separate occasions. The base in fusional vergence showed no statistical difference before or after adaptation, for any of the time periods. Also there was no difference in the ranges obtained over the three time periods. It was concluded that, even after a 2 min period of adaptation, fusional vergences return to a similar level as before the horizontal deviation was induced.

Item Type: Article
Copyright, Publisher and Additional Information: Copyright © 2000 British Orthoptic Journal
Institution: The University of Sheffield
Academic Units: The University of Sheffield > Faculty of Medicine, Dentistry and Health (Sheffield) > School of Medicine (Sheffield) > Clinical Sciences Division South (Sheffield)
Depositing User: Sherpa Assistant
Date Deposited: 26 Aug 2005
Last Modified: 07 Jun 2014 20:50
Status: Published
Refereed: Yes
URI: http://eprints.whiterose.ac.uk/id/eprint/626

Actions (repository staff only: login required)