I did a bit of poking around and it seems that it generally is contraindicated because people with autoimmune diseases are prone to something called corneal melting (which sounds like a particularly uncomfortable thing to have happen). According to the Mayo Clinic, having autoimmune diseases such as RA can increase the risks. One of these risk is a temporary increase in dryness and since one of the comorbidities with RA is Sjogren's Syndrome, which causes dry eyes, mouth, etc., there is some cause for concern. This article claims that it may not be unilaterally contraindicated anymore, that for people who have well-controlled disease (i.e., are in remission), it may be feasible to get a good result.
Personally, given the increased risks due to RA, I'd be very hesitant to have LASIK surgery and definitely have a thorough discussion with my rheumatologist an ophthalmologist before going ahead.
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