Glossary

Author: Glossary

  • Homonymous parallax

    Parallax in which, when one eye is covered, the object viewed appears to move closer to the uncovered eye.  

  • Heteronymous parallax

    Parallax in which, when one eye is closed, the object viewed appears to move closer to the closed eye.  

  • Binocular parallax

    The basis of stereoscopic vision; the difference in the angles formed by the lines of sight to two objects at different distances from the eyes. This is important in depth perception.  

  • Parallax

    The apparent movement or displacement of objects caused by change in the observer’s position or by movement of the head or eyes. The apparent shift or disparity in the perceived direction of an object when observed from two distinct points that are not aligned in a straight line with the object.  

  • Paralgia

    An abnormal sensation that is painful.  

  • Paralepsy

    A temporary attack of mental inertia and hopelessness, or sudden alteration in mood or mental tension.  

  • Paralambdacism

    Inability to say the letter “1” correctly, with the substitution of the sound of another letter for it. A speech disorder where the sound of the letter “L” is substituted with different letters.  

  • Paralalia

    Any speech defect characterized by sound distortion.  

  • Parakinesia

    A condition in which movement is abnormal.  

  • Parakeratosis scutularis

    A scalp disease with hairs encircled by epidermic crust formation.