Question: If someone was wearing red-tinted glasses, would they still be able to hallucinate red images? Or any other colour? Sorry if it's not medicine-related enough.

John Robert Davis answered on 27 Jan 2014:

Great question and no need to apologise. To answer I am going to tell you about an odd condition which will maybe shed light on hallucinations. There is a syndrome called Charles Bonnet syndrome which causes blind people to hallucinate and feel like they can see. These can be reoccurring and incredibly complex visions even if the person was born blind. This suggests, and there is evidence to support it, that hallucinations have very little to do with the ability to see but is all about how your brain communicates with itself.

So yes, people hallucinating with red glasses on will probably still see the most vivid red of their lives.