It sounds like you have a solution to the original problem. I would
suggest also that you keep in mind that R. A. Fisher had very poor
eyesight - the proverbial coke bottle lenses - and it was speculated (J.
F. Box, "Life of a Scientist") that this drove his development of
visulalized (imagined) objects, such as factor spaces in multiple
dimensions. While he was not fully blind, I think there may be a
parallel to your students' situation there.
Cheers,
Jay
.
.
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