Hess test charts for diplopia (double vision)

Hess test charts for diplopia (double vision)

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Caption: Hess test for diplopia. Charts showing the results of a Hess test to measure the extent of diplopia (double vision) in a patient. In the Hess test the patient's left and right eyes see two similar grids superimposed by angled mirrors. They are then asked to point out the grid's intersection points with a marker. These points give the blue crosses seen here. In a normal patient the results would be centred on each chart. The distortion in this example is caused by uncoordinated move- ments of the muscles controlling the eyeballs. The small black arrows pointing horizontally and vertically represent the eyeball's muscles.

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Keywords: charts, diagnostic, diagnostics, diplopia, double vision, equipment, eye, eye disorder, eye test, healthcare, hess chart, hess test, hess test chart, hess test charts, medical, medicine, ophthalmic, ophthalmology, technique, test

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