Apparatus and method for assessment and rehabilitation after acquired brain injury
The present invention relates to an apparatus and method for the assessment and rehabilitation of vision impairment. In particular, the invention is concerned with an apparatus displaying visual stimuli and the method of using this device for the purpose of assessment and rehabilitation of individuals with acquired brain injury and visual impairment resulting therefrom. The apparatus comprises a display means with a plurality of visual stimuli switched on and off in predetermined sequences. The sequences are adapted to be used to assess and rehabilitate a person's visual impairment.
1. An apparatus for assessing and rehabilitating a person's visual impairment, the person's visual impairment defined by a visual field deficit as compared to an unaffected visual field where there is no visual impairment including a display, the display including a plurality of visual stimuli wherein said plurality of visual stimuli are arranged in a spaced apart configuration so as to substantially cover what would be the expected unaffected visual field of the person as defined with reference to a respective viewing position located in front of and spaced from the display, wherein said plurality of visual stimuli are switchable between on and off conditions in predetermined sequences to cause compensatory scanning movement of the head and eyes of the person viewing the display in order to assess and rehabilitate the person's visual impairment.
2. An apparatus as in claim 1 wherein said visual impairment is resultant from an acquired brain injury.
3. An apparatus as in claim 1 wherein said display is a display board.
4. An apparatus as in claim 3 , wherein said display board is of rectangular configuration and said plurality of visual stimuli are arranged equally spaced in two rows.
5. An apparatus as in claim 3 , wherein said display board is mounted horizontally on a support and wherein said support is vertically adjustable.
6. An apparatus as in claim 1 wherein said plurality of visual stimuli are light emitting devices capable of being switched on and off.
7. An apparatus as in claim 1 wherein said plurality of visual stimuli are coloured.
8. An apparatus as in claim 1 wherein said apparatus is adapted to be used to teach clinicians to assess and rehabilitate said persons using said predetermined sequences.
9. A method of assessing and rehabilitating a person's visual impairment, the person's visual impairment defined by a visual field deficit as compared to an unaffected visual field where there is no visual impairment, the method comprising:
assessing the person's visual impairment using an apparatus including a display, the display including a plurality of visual stimuli such that said plurality of visual stimuli are switchable between on and off conditions in a first set of predetermined sequences to cause compensatory scanning movement of the head and eyes of the person viewing the display; and
rehabilitating the person's visual impairment by switching the plurality of visual stimuli in a second set of predetermined sequences to develop head and eye scanning strategies to compensate for the visual field deficit.
10. An apparatus as in claim 1 wherein multiple visual stimuli of the plurality of visual stimuli are displayable simultaneously in the predetermined sequences.
11. An apparatus as in claim 3 , wherein said display board includes a marker fixed in the centre of said display board for alignment of the eye level of the person.
12. A method of assessing and rehabilitating a person's visual impairment as in claim 9 , wherein the head and eye scanning strategies include developing consistent head movement to compensate for the visual field deficit caused by the person's visual impairment.
13. A method of assessing and rehabilitating a person's visual impairment as in claim 9 , wherein the head and eye scanning strategies include developing a scanning speed appropriate for the accurate detection of stimuli.
14. A method of assessing and rehabilitating a person's visual impairment as in claim 8 , wherein the head and eye scanning strategies include developing a scanning frequency corresponding to the ability for the person to negotiate daily activities.
15. A method as in claim 9 , wherein:
the display is a display board; and
the plurality of visual stimuli are arranged in a spaced apart configuration on the display board so that the plurality of visual stimuli substantially covers what would be the expected unaffected visual field of the person as defined with reference to a respective viewing position located in front of and spaced apart from the display.
16. A method as in claim 9 , wherein the first set of predetermined sequences and the second set of predetermined sequences are substantially the same.