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Understanding Visual Field Testing NCEyes June 2018

5/25/20181 Understanding Visual Field TESTINGC aroline B. Pate, OD, FAAOA ssociate Professor, UAB School of Optometry, Birmingham, ALDefinitions2 Visual Field : The portion of space which is visible when gaze is fixed in one direction Perimetry: The measurement of the extent and sensitivity of the Visual fieldIndications for Perimetry History General medical problems Neurological problems Ophthalmic problems Potentially toxic medications3 Indications for Perimetry Examination Unexplained reduction in best corrected Visual acuity Defect noted on confrontation fields Abnormal pupils or EOM s Proptosis Elevated intraocular pressure4 Indications for Perimetry Funny looking optic disc Retinal or ChoroidalDisease5 Purposes of Perimetry Detection of defects (screening function) Definition of defects ( , location, shape, and depth) Clinical correlation (what caused the defect?)

It is best to test the visual field with a pupil diameter of at least 3 mm (record pupil size when testing visual field) Fixation Important to monitor during visual field testing Target blur Media opacities (e.g., cataracts) Age 14 decreased sensitivity can …

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