Our expert says:
I have found limited use for ritalin, and have never ( nor has anyone I have worked with ) kept someone on Ritalin for 20 years. So I don't have direct experience of the situation you are describing. I am being frank. I have not encountered it as a cause of allergy or eye pain - that's not to say this cannot happen, only that it has never happened in my presence !
I sympathize with what sounds like a very unpleasant situation, and wish I knew how best to relieve it.
You ask why such isues have not been researched - sadly this is probably just because research is very time-consuming ( it'd take more than 20 years and many people on ritalin for that long agreeing to take part in the research, to study it ), and very expensive, and it'd be hard to find someone or some organization prepared to fund such research.
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