In college, learning to become a teacher of students with visual impairments, I learned all about the parts of the eye and how each part functions. I learned about various types of eye damage and what kinds of visual impairment that damage might cause. This helped explain the student’s functional vision to create the optimal environment for learning.
For CVI we need to do the same for the brain: understand the parts of the brain and to understand how each part of the brain functions (as currently understood by vision neuroscientist). Hopefully in the future, we can understand how that damage causes certain kinds of visual impairment.
For now, we assess child’s visual functioning by using assessment based on visual behaviors that we know are common for CVI. In the parent interview, other unique manifestations of CVI might be identified and need assessment. This helps me explain the student’s functional vision so the team and parents can create the optimal environment for learning and to measure visual improvements that are expected.
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cvi teacher 
Hello, The book 2015 Vision and the Brain edited by Lueck and Dutton does indicate what damage causes what kind of visual impairment. Best wishes, Carmen
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I have read both of Dr. Dutton’s books
While there are theories about what part of the brain generally used for vision, there is no definitive way to look at any kind of brain scan and diagnose CVI. Brain scan technology, at this point, is not useful for diagnosis of any kind of CVI. There is work being done to use diffuse spectral imaging to look at a very small population of teenagers with CVI (affected by periventricular leukomalacia), that is the only one currently underway. (Lofti Merabet’s research at Harvard Medical School).
So no, there is not a way to say what damage causes what visual functioning.
I look forward to the day this level of understanding exists.
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