Dannenbaum E, Paquet N, Hakim-Zadeh R, Feldman AG

J Otolaryngol. 2005 Feb;34(1):13-9..

Vestibular Rehabilitation Program, Jewish Rehabilitation Hospital Site of CRIR, Laval, Quebec, Canada.

OBJECTIVE: To determine the influence of frequency and direction of head movement and type of vision chart on the score of a clinical test of dynamic visual acuity (DVA). METHODS: The subjects were 31 healthy individuals (22 to 79 years old) and 10 patients (19 to 70 years old) with a unilateral vestibular deficit owing to surgical resection of an acoustic neuroma. They read a Snellen or an E-chart while their head was passively moved +/- 20 degrees back and forth in the horizontal or vertical direction at one of four frequencies (0.5, 1.0, 1.5, and 2.0 Hz). The DVA score was the difference in the number of lines on the vision chart that could be read with the head passively moved versus with the head immobile. RESULTS: Four healthy subjects had a low DVA score during horizontal head movements at the fastest frequency (2.0 Hz) with the Snellen chart. In patients, DVA scores significantly decreased as head movement frequency increased from 0.5 to 1.0 Hz and from 1.0 to 1.5 Hz, during horizontal and vertical movements, and with both vision charts (p < .001). The DVA scores of healthy subjects were more consistent across three trials with the E-chart than with the Snellen chart at 1.0 and 0.5 Hz (horizontal movements, p < .01) and at 1.5 and 1.0 Hz (vertical movements, p < .01). CONCLUSIONS: This study provides new indications on the optimal parameters for the clinical test of DVA. From the results, it is recommended that DVA be tested during horizontal and vertical head movements at a frequency of 1.5 Hz with the E-chart.<

This abstract is being posted for educational purposes, as well as for comment and criticism, by the visitors to the Acoustic Neuroma Foundation website. This abstract is representative of a larger article that is indexed on Medline.

Men's Health Web Ring

    SurvivingProstateCancer
      WithoutSurgery.org

  VasectomyFoundation.org

   Prostatitis Foundation
    ( Prostatitis.org)

Disclaimer: Information provided on this web site is for educatonal purposes only. It is not a substitute for, nor can it replace advice from your own physician. The information on this site is not to be used for diagnosing or treating any health concerns that you may have. You must see your own physician for diagnosis and treatment. Furthermore, the information on this site is never guaranteed to be 100% accurate or 100% up to date. All the side effects of mentioned treatments, drugs, surgeries, or therapies cannot always be listed or be known. Errors and omissions may occur in any essay. See a competent physician for your health care needs.
http://www.acousticneuromafoundation.org™ Established December 11, 2002