I had a dry eye problem for a while in the mornings (not cancer related) and found it has virtually not bothered me since I cut my omega six oils and have taken 3 - 5 teaspoons of fish oil a day.
I have seen that omega three has many functions in respect of eye formation health etc........ so I just now looked up dry eyes and omega three on google and I should have expected it but was surprised to finds lots of links. Here are two. All of which goes to show that "common sense" observations based on one's experiences may have some foundation.
RB
http://www.clevelandclinic.org/healt...sp?index=12603
http://www.allaboutvision.com/conditions/dryeye.htm