Graphical representation of total convergence as a function of accommodation for any fixation distance. The accommodation in dioptres is represented on the ordinate and the convergence in prism dioptres (or metre angles) on the abscissa. It is used to represent the binocular status of the two eyes, as well as evaluating the patient's visual discomfort at any distance. See relative amplitude of accommodation; relative convergence; demand line; binocular vision single zone of clear.
Millodot: Dictionary of Optometry and Visual Science, 7th edition. © 2009 Butterworth-Heinemann