I am on medication – Plaquenil, and every 6 months I have to have a special eye exam. I take some other meds so that I can be comfortable when trying to sleep. As far as heat, that is a tough one. Just a couple of days ago, I was seated outside in the shade, but the sun did come through the trees a couple of times, and that is all it took for me to be bedridden and in pain the following day. I try to not get overheated because that makes me have a bad reaction.