BOTT CONFRONTATION
FIELD TARGET - Mk II
(also known as the)
BOTT CONFRONTATION WAND
The Bott confrontation field target was designed by New
Zealand Optometrist Alan Bott who recognized the need for a small reliable low
cost target to assess the visual fields of patients.
It has been well documented that a flashing light of know intensity and size is
a suitable target for visual field testing. It is the purpose of this device to
provide a suitable target when assessing fields by confrontation.
It consists of a handle with switch containing electronic circuitry and two AA
size batteries to power the instrument. The handle supports a 330mm
long black wand which contains the flashing light. The light is fitted into the
side of the wand which allows it to be easily turned away from the subject to
allow for false positives tests.
Directions
· Place subject directly in front of examiner in subdued light.
· Patient covers one eye with card and told to watch examiners opposite eye
(i.e. if testing the right eye the subject is asked to look at the examiners
left eye).
· The device is held in the blind area beyond the subject's field of view and
switched on.
· It is then brought slowly forward and the subject is asked to tell the
examiner when they see the flashing light.
· The extent of the field can be estimated by the examiner.
· The device can be used as a target for the Bjerrum Screen for assessment of
gross areas of field loss.
Should the examiner feel that the subject either does not understand or is
commenting when he sees something other than the light, then the wand can be
rotated through 180o which will prevent the light from being seen by the
subject. If the examiner still gets a response, he will know he has a false
positive and will need to re-instruct/test the subject.
Bott
Confrontation Field Target (Wand)
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