Date of Award

5-2007

Degree Type

Thesis

Degree Name

Master of Science in Vision Science

Committee Chair

Bradley Coffey

Abstract

PURPOSE: Previous studies have shown that dynamic visual performance remains relatively constant until mid-life then decreases gradually with increasing age. A new device that measures dynamic visual acuity using a stationary stimulus viewed during calibrated head movements shows excellent potential to monitor vestibular dysfunction. A normative database consisting of adults over 60 years of age was needed in order to expand on a previous study by Richards and Olmschenk.

METHODS: Twenty-eight volunteers over the age of 60 were evaluated using the inVision TM system by NeuroCom International, Inc. Each subject was tested using three protocols: clinical test of sensory interaction and balance (CTSIB) using the posturography platform, dynamic visual acuity (OVA) and gaze stabilization test (GST) using the head-borne accelerometer. For OVA and GST, subjects were instructed to move their heads back and forth (as if to say "no") at different velocities while making a forced choice as to the orientation of a tumbling E presented on a computer screen.

RESULTS: The data obtained were combined with the data from Richards and Olmschenk's study. There tends to be a decrease in overall performance with age, with statistically significant differences in all variables for the 70's and 80's decades.

DISCUSSION: The age-related decrease in OVA is consistent with previous studies. With the normative database of the in Vision TM system expanded to include a larger age range, it can better be utilized to monitor vestibular dysfunction.

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Optometry Commons

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