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Do you have frequent headaches or migraines? 10.3 also shows that if the card distance is increased without changing the separation of the pictures, i.e., the card holder is drawn away from the patients eyes, the picture separation will now be narrow for the new card distance and therefore convergence will be required to maintain fusion. The Vestibular Disorders Association (VeDA) strives to create an inclusive community where everyone feels valued, represented, and respected. These repetitive cycles of misalignment/realignment appear to lead to an overuse of the eye alignment muscles, which can result in the symptoms of VH. is a good place to start if you suspect you may have VH. Vertical heterophoria is a type of binocular vision dysfunction that causes problems in your day-to-day functioning. There are many different designs of stereoscope. 13,16 This method also results in the least amount of prism needed to relieve symptoms. finger) to maintain ones place, words running together, losing ones place, Routine visual symptoms: blurred vision, difficulty with close-up vision, difficulty with night vision, eye strain, sore eyes, Binocular vision symptoms: double or overlapping vision, shadowed vision, light sensitivity, difficulty with glare or reflection, closing one eye while reading, Psychological symptoms: feeling overwhelmed or anxious in a crowd, agoraphobia, feeling overwhelmed or anxious in large spaces (e.g. What Is Vertical Heterophoria? With polarised vectograms ( Fig. Why Avoid Them? This technique follows the principles of conventional vision therapy. Difficulty in seeing both the diplopic images indicates a gross degree of suppression, which is usually overcome quite quickly in heterophoria. In general, the object of this type of exercise is to exert the fusional reserve while keeping the accommodation unchanged: or, the other way round, induce changes in the accommodation while maintaining fixed vergence. Ocular Motility and Strabismus.