The Clinical Usefulness of the Induced Tropia Test for Amblyopia

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Abstract
The technique of inducing a deviation with a prism to aid the observation of a patient's binocular fixation pattern has been said to identify patients with amblyopia and to differentiate amblyopia from strong fixation preference. This study was undertaken to evaluate the sensitivity of the Induced Tropia Test (ITT) for detecting amblyopia, assess reproducibility between observers, and technique. Fixation patterns of 38 patients were evaluated with the 10 diopter base down and the 25 diopter base in prisms. The responses to each ITT were also compared to the results of visual acuity testing. In our series there was no clear superiority of either the 10 diopter BD or 25 diopter BI prism. The IT tests did identify those patients with visual acuities of two or more lines difference. However, IT tests failed to differentiate amblyopia from fixation preference.

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