The position of your elevated foot is the extreme edge of your lower visual field.
Here, below, is the image used in the previous section to demonstrate different visual fields.
By using the same shape to represent a visual field (oval) and creating a simple numbering system (based on a clock face, below) we have a template to record responses in the different areas of the person's visual field.
When moving your foot, if you could see it when a few inches off of the floor, then you would mark it near the number 6 (or near 6 o'clock) on a diagram representing your visual field.
The extremes of your left and right visual field, from the first exercise would be around 9 o'clock (left hand) and 3 o'clock (right hand), in someone who was aware of their wiggling fingers with their arms fully outstretched.
Now move both of your outstretched arms up and down, like a snow-angel (whilst wiggling your fingers), to consider your visual fields above and below the 9 o'clock and 3 o'clock marks.
No one has a perfect oval as their visual field, this is just a template used to mark areas where useable (functional) vision is present, not present, or sometimes present.
It is possible to have full periphery vision, but areas within the centre of the visual fields where responses are either absent, or inconsistent.
All areas of the visual field need to be assessed and understood for this reason.
Try these exercises with some other people, you may find that everyone is slightly different.
This is useful, not to scientifically measure your visual fields (there are visual field tests your optician can perform if you need this). This is useful to give you a sense of your own visual field, and maybe that everyone's vision is slightly different
With CVI these differences in the visual field can have a considerable impact on everyday activities.
We will be using the diagram based on a clock (above) to record the person's visual responses in all areas of their visual field, in relation to both:
Use two templates (which you can print from this section) to record your findings
one for moving targets
one for non-moving targets.
You need to complete every segment, separately, in relation to visual responses with movement, and without movement.
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