Here's one of Joanie's binocular tips of the week. Many people don't realize they are squinting to some extent when looking through a binocular. Squinting is not a big deal for quick peeks and short observing sessions, but even a little squinting will produce noticeable eye fatigue over long observing sessions, even to the extent of producing fuzzy images and headaches. So, when using binoculars, practice relaxing all the muscles in your eyes and use the binocular, exclusively, to do the focusing. Fully relaxing the eyes is especially important when making the initial diopter adjustment for your eyes. "You are getting sleepy …"