Certified Ophthalmic Medical Technologist (COMT) Practice Exam

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What test reveals both tropia and phoria during an examination?

Cover test
Prism and alternate cover test
Hirschberg's estimation
Dynamic visual acuity test

The correct answer is: Prism and alternate cover test

The prism and alternate cover test is designed to assess both tropia and phoria in a patient's alignment and ocular alignment. By alternately covering one eye and then the other, this test allows the examiner to observe the movement of the eyes and determine the presence of any misalignment, whether it is a constant deviation (tropia) or a latent deviation that becomes apparent only when one eye is covered (phoria). During this test, when one eye is covered, the uncovered eye may shift to fixate on a target. If the eye is misaligned, the movement indicates a tropia. After switching the cover between eyes, if there is no shift in fixation when one eye is uncovered but a misalignment presents itself, this indicates a phoria. Thus, the prism and alternate cover test provides a comprehensive evaluation of both conditions in a single procedure, making it the most effective choice for this assessment.