Pediatric Visual Acuity Strategies: Induced Tropia Test
Creator
Anat Bachar Zipori, MD; Nasrin Najm-Tehrani, FRCS Ed (Ophth), FRCSC
Affiliation
(ABZ) Department of Ophthalmology, Tel Aviv Sourasky Medical Center, affiliated to the Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel; (NN) Department of Ophthalmology and Vision Sciences, The Hospital for Sick Children, Toronto, Faculty of Medicine, University of Toronto, Canada; FRCS Ed (Ophth) FRCSC
Subject
Induced Tropia; Prism Test
Description
Induced Tropia Test. Using a 10-20 base-down prism, this exam demonstrates equal vision in both eyes. If there is evidence of ocular misalignment, prisms can be used to neutralize the movement and thereby measure the deviation, whether it is a heterotropia or heterophoria. Prisms are placed in front of either eye such that the apex of the prism is oriented in the direction of the deviation, and the prism strength is altered until the deviation is no longer observed. This video supplements Paediatric Neuro-ophthalmology: Visual Acuity Assessment Strategies: https://collections.lib.utah.edu/ark:/87278/s6vh9z9g
