It's not a good idea to self medicate animals however you will find that human eye ointment for conjunctivitis is quite safe to use on animals. I had a dog that was a toy breed and she often got conjuntivitis. The vet prescribed over the counter medication called Brolene. I asked the chemist about it also and said it was for my dog and he told me it was completely safe to use. Even if the eye is just sticking this treatment will lubricate the eye and might help clean up any infection.
The cedar walls on your house shouldn't casue any concern to your glider. Cedar shavings can cause respritory problems as they have a very strong smell and have been fresh'y cut. Your walls shouldn't have any smell left on them if the planks have been up for a while. Freshh ceadar bord might be a liitle worse though, so shouldnt be a problem even if they climb on it.