I answered the question "Why aren't optical illusions called visual illusions?" and would like to get more information to improve my answer.
In doing a search on Ngram for occurrences of the expressions "optical illusion" and "visual illusion" I saw that "visual illusion" appeared in 1900. It might have existed earlier.
- When did "optical illusions" start being seen as "visual illusions?" By visual illusions, I mean phenomena of the brain and visual system.
- In your field (cognitive/neuro sciences) is the expression "visual illusion" now preferred over "optical illusion?"
- Also, sources say that interest in optical illusions goes back to Aristotle and the ancients. What were these optical illusions they were interested in?