DEPISTEO VT1 Series User Manual
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Contents
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This document is the property of DEPISTEO. Its contents cannot be reproduced or divulged without the company's approvalPage 51 / 78V04.07.00March 20185.2. Children phorias test5.2.1. PurposeThe phorias test measures parallelism of the ocular axes at physiological rest for children.All phorias (heterophoria) translate as eye strain (asthenopia), notably in intense conditions (screen work).Eventually heterophoria, along with fatigue, can become diplopia (double vision). This test is particularlyinteresting for screening latent heterophorias.5.2.2. Interpretation limitsThis test is only significant when visual acuity in the right and left eyes is practically identical. This test cannot beinterpreted with large differences in acuity between the two eyes. In this case, the heterophoria would not bedue to eye strain, as the best eye takes over and becomes dominant.5.2.3. DefinitionA grid containing different symbols is presented to the left eye while a dot is presented to the right eye.Without neutralization of one of the images by the brain, the two images should superimpose. Localization ofthe while dot on one of the numbered zones of the grid qualifies the type of phoria: the grid is sized so as toreveal an esophoria of 6 diopters, an exophoria of 6 diopters and a hyperphoria of 1 diopter.5.2.4. Patient instructionsOn which image is the dot blinking?ļ Note the response on the response form.5.2.5. Expected responsesThose that appear on the response form.The VT1 software measures the deviation.If the white dot or the grid is not perceived, the brain has neutralized one of the images.If the dot is perceived outside of the grid, the heterophoria is over 6 diopters.Orthophoria HyperphoriaEsophoria ExophoriaWith this test, the VT1 can completely dissociate the two eyes, indirectly performing a well-known test, the |
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