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  • Title: [Assessment of visual acuity in simulation and aggravation].
    Author: Fahle M, Barth V, Henke-Fahle S, Mohn G.
    Journal: Klin Monbl Augenheilkd; 1989 Dec; 195(6):356-62. PubMed ID: 2622122.
    Abstract:
    Following a review of various tricks and techniques described in the literature for measuring the visual acuity of less cooperative patients, three new methods are presented. The first is based on the so-called "preferential-looking" method, which has been in use for several years to determine the visual acuity of infants and small children. The second method uses polarizing filters to separate the beam paths of the two eyes and a flashlamp to project the test symbols, to prevent the patient from finding out by blinking which eye is being tested. In the third method the stimuli are presented on a computer monitor; the beam paths of the two eyes are separated by special spectacles which can briefly cover either eye while a test symbol is being shown. The results so far are encouraging.
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