Dry eye syndrome is very common after Lasik. Mine turned into corneal erosion. There is an explosion of research now on Lactoferrin (a lipid in tears) for many purposes: ulcers, gastrointestinal flora balance, antibacterial, anti-inflammatory, osteoporosis, autoimmune disorders such as arthritis, dry eye syndrome, et al.
Here is a url that might interest you re dry eye syndrome:
http://abstracts.iovs.org/cgi/content/abstract/46/5/2046
This particular study used 270 mg per day.
Read all the postings about the diagnosis and treatment of dry eyes. Beta blockers are not a medication that would likely make dry eyes develop or get worse.
JCH III MD