Orthophoria is a condition of binocular fixation in which the lines of vision meet at the object toward which they are directed, and considered as a normal condition of balance of the ocular muscles of the two eyes.[1][2][3] The condition opposite of Orthophoria, is called heterophoria.[3]



  1. Scobee, Richard (19 August 2008). The Oculorotary Muscles. University of Michigan: Mosby. ISBN 9780598882172.
  2. "Medical Definition of ORTHOPHORIA". www.merriam-webster.com. Retrieved 11 February 2018.
  3. "orthophoria". Retrieved 11 February 2018 via The Free Dictionary.

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