VON GRAEFE TEST: The Von Graefe phoria test is a common clinical method to measure heterophoria (a latent eye turn) by using prisms to dissociate the eyes and have the patient align two separate images. HOW IT WORKS: Setup: The patient looks at a fixation target through a phoropter or trial frame at a specific distance (e.g., 6 meters for distance, 40 cm for near). Prism placement: A vertical prism (like a 12Δ base-up) is placed before one eye to vertically separate the images. A horizontal pris
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VON GRAEFE TEST: The Von Graefe phoria test is a common clinical method to measure heterophoria (a latent eye turn) by using prisms to dissociate the eyes and have the patient align two separate images. HOW IT WORKS: Setup: The patient looks at a fixation target through a phoropter or trial frame at a specific distance (e.g., 6 meters for distance, 40 cm for near). Prism placement: A vertical prism (like a 12Δ base-up) is placed before one eye to vertically separate the images. A horizontal pris
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Ask Dr. Julie: What Is Vertical Phoria And How Is It Treated?
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Phoria is a tendency of the eyes to deviate from their normal alignment when one eye is covered. To check for phorias, a visual test called the cover test is used. During the cover test, the patient is asked to focus on a distant object while the examiner covers one eye with an opaque object, such as an eye patch or an index card. The examiner observes the uncovered eye to see if it maintains its fixation on the distant object or if it moves to correct the deviation caused by the covered eye. #p
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Phoria is a tendency of the eyes to deviate from their normal alignment when one eye is covered. To check for phorias, a visual test called the cover test is used. During the cover test, the patient is asked to focus on a distant object while the examiner covers one eye with an opaque object, such as an eye patch or an index card. The examiner observes the uncovered eye to see if it maintains its fixation on the distant object or if it moves to correct the deviation caused by the covered eye. #p
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