• Corpus ID: 17406264

Calibration of the Hirschberg test in human infants.

  title={Calibration of the Hirschberg test in human infants.},
  author={Patricia M. Riddell and Louise Hainline and Israel Abramov},
  journal={Investigative ophthalmology \& visual science},
  volume={35 2},
PURPOSE The Hirschberg ratio has been defined as the ratio of the change in angular position of the line of sight to the change in location of the first Purkinje image relative to the pupil center. This study was designed to determine empirically whether the adult value of the Hirschberg ratio (approximately 22 prism diopters/mm) is a suitable value to use for all ages. Because many structures in the eye are growing during the 1st year, it is possible that there could be some change in the… 

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