When my eye Dr said preservative-free, GenTeal was one of the "ALLOWED" brands he listed.
Did he give you a list or any other direction?
I think my directions were something like:
plus a list of good ones was provided.
Maybe you can call his office and get more information.
Lynnwood, Lupus & Sjogren's Moderator, Dx: 2002DIAGNOSING LUPUS & HW's LUPUS 101
"Life is far too important to be taken seriously." - Oscar Wilde