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
24.5K views6 months ago
FacebookVision Scientist
Use of Maddox Rod (in simple ophthalmic terms): The Maddox rod is a subjective test used to assess ocular alignment and detect heterophoria or tropia. Main Uses: Detection of phoria and tropia Helps identify latent squint (phoria) and manifest squint (tropia). Measurement of horizontal deviation Used for esophoria / esotropia and exophoria / exotropia. Measurement of vertical deviation Helps detect hyperphoria or hypophoria. Breaks binocular fusion Converts a point light into a line, preventing
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Use of Maddox Rod (in simple ophthalmic terms): The Maddox rod is a subjective test used to assess ocular alignment and detect heterophoria or tropia. Main Uses: Detection of phoria and tropia Helps identify latent squint (phoria) and manifest squint (tropia). Measurement of horizontal deviation Used for esophoria / esotropia and exophoria / exotropia. Measurement of vertical deviation Helps detect hyperphoria or hypophoria. Breaks binocular fusion Converts a point light into a line, preventing
29.4K views4 months ago
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