Abstract
Decreased visual acuity is the most common complaint in functional ophthalmic problems. Although some tests for physiologic reflexes such as optokinetic nystagmus or preferential looking can be helpful, most tests depend upon the persuasion or tricking of the patient so that they are using the bad eye when the patient believes he is using only his good eye as he cooperates with the test. The techniques include refractive dexterity with down up refraction, sham lenses, neutralizing cylinders, and character counting on visual acuity charts. There is an occasional role for visual evoked potential / response, electroencephalogram, electroretinogram, potential acuity meter testing or acuity testing with the laser interferometer.
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Enzenauer, R., Morris, W., O’Donnell, T., Montrey, J. (2014). Tests for Decreased Vision. In: Functional Ophthalmic Disorders. Springer, Cham. https://doi.org/10.1007/978-3-319-08750-4_10
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