I want to know the answer to the following question:
Alhazen's  experimental proof of the intromission model of vision led to the change of understanding of what?
All the background I'm provided with is that "His experimental proof of the intromission model of vision led to changes in the understanding of the visual perception of space, contrary to the previous emission theory of vision supported by Euclid and Ptolemy.". Is that enough to answer the question?
Answer: no