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5 Cards in this Set
- Front
- Back
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Tropia is?
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A tropia is an eye turn or deviation that the patient has no, or very little, control over. The patient is unable to keep the eye straight with the power of fusion. Even though there is such a thing as an intermittent tropia, a tropia is a manifest deviation, meaning it is evident upon inspection and is not hidden.
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What is a Phoria?
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A phoria is a muscle imblance that is hidden by fusion. The eyes remain straight as long as fusion is present. The phoric deviation only becomes evident when fusion is disrupted.
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When performing the cover test, our job as technicians is to answer the question:?
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Is there a tropia present? Yes or no. If the answer is yes, we should identify (name) the tropia. The Uncover Test (Sections 2 and 3) and the Alternate Cover Test (Section 4) will be used to detect a phoria.
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In a cover in cover test which eye is the tech watching?
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The eye that is covered. The goal of the testing procedure is to disrupt fusion (cover) and observe which direction the covered eye moves to take up fixation when double vision occurs (uncover).
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Difference between a tropia and Phoria?
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The terms left or right exotropia are used because left or right describes which eye is deviating when both eyes are not covered. In the case of a phoria, both eyes fixate (do not deviate) when the eyes are not covered.
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