Re: cataract surgery and MCS - multiple chemical sensitivity
Hello and welcome. In the U.S., the mainstream medical community apparently considers MCS (multiple chemical sensitivity) a controversial diagnosis, one without proven diagnostic tests and treatments. Therefore I'm not sure what aspects of cataract suregry you're concerned about. The local anesthesia? Eye drops? Sedative? The corneal implants themselves?
In general, I've never read about any way to correct cataracts other than surgery. (Sorry! Hopefully others will add more on this.)
Certainly long-term steroid use can cause numerous undesirable side effects. In the U.S., the antimalarial Plaquenil is often prescribed for lupus, MCTD, UCTD, etc. The reason it's so well-regarded here is that it's been shown to be steroid-sparing---meaning it can sometimes totally eliminate the need for steroids---or, for patients who still must take steroids due to more severe problems, Plaquenil can reduce the steroid dose required. Is Plaquenil used in Italy, have you ever asked? If it is, are you a candidate? (I realize that you'd still have to deal with your cataracts, but reducing your odds of OTHER steroid complications seems like a goal worth asking about.)
Another thought: you could also ask on the "Eye and Vision" board about cataract surgery and your chemical sensitivity concerns. To access that board, select "Find a Board" (hyperlink in the blue bar above), then look under the "Eye, Ear, Nose, Throat" category.
I hope others add more. Best wishes, sincerely, Vee