>> Sara: The next characteristic we'd like to talk about is visual field preferences. Most people with CVI have some kind of visual field preference. Central and particularly the lower visual field is not typically preferred, due to the way the visual system develops and the type of damage that causes CVI. Putting something on their desk or wheelchair tray, or right in front of a student with CVI may not be the best placement for materials. Often it needs to be raised by placing it on a slant board for it to be detected. 
So, the video clip we have is a student with a pretty obvious visual field issue. Interestingly enough, this particular student with CVI prefers the central over the peripheral visual fields. 
You'll know exactly when she sees this preferred, familiar visual target. 
[Video Dialog] 
Ready... 
...set... 
Sit down? 
Ah! 
Then it just appeared over there all of a sudden. 
Okay. Ready... 
set... 
Go. 
Go! 
[end Video Dialog] 
>> Lynne: Mixed field preferences, we believe, happen when the two sides of the brain are not communicating with each other. And the student may use one side, one eye, for locating using the 'where' system, and then another field for focusing and attending using the 'what' system. So if you have ever seen a child move from one field to another, this may be indicative of mixed field preferences. The child is using both fields, but they are not integrated yet.