Just been reading the post by Twitchytoes about Sjogren's Syndrome. Whether you have secondary Sjogren's or just RA dry eyes, there's a very useful table in it with a range of ocular-lubricants, including those without preservatives, which I don't think are routinely prescribed by GPs.
healthunlocked.com/api/redi...
Here's the link. There's a small clip from the table in the pic above...
My GP just prescribed Viscotears for my excessively dry eyes and it was only when I went to Eye A&E with scleritis and mentioned as an aside how painfully dry my eyes were that I was given 2 better ocular-lubricants, most importantly both without preservatives. I now get these on script instead.
The list of the ones that don't contain preservatives is on the far R of the table. Hope it's of use to someone else too...