What Causes Double Vision After Doing Mild Exercises?

I experienced double vision while doing some mild exercises that I have started. My right eye felt full,,,,possibly pressure......I am being treated for glaucoma...and do take drops 4 times a day and my most resent visit I had a pressure of 12 in both eyes. My distant vision was fine....close up vision from each eye was good but together was doubled. After a nights sleep my vision is fine and don t have any of the systoms from the night before. What should I be looking at. Thank you for your time. My name is Dianne and my e-mail address is YYYY@YYYY I am 67, very active....walk 5 big dogs daily, work part time...and am a care taker for my father who is 95.