![]() The doctor advises this test for those who suffer from tropias (deviation of the eye when the eyes are open) not for those who suffer from phoria ( misalignment when binocular fusion view is broken). When the prism brings the reflection in each eye to the center, the device detects the correct prism measurement and measures it. Doctor asks you to look at the penlight, he/she places different prisms of different strengths in front of your eye. ![]() This is the same Hirschberg test but with a prism. This test is to measure the degree of misalignment.
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