From my home office window I can look outside and watch squirrels cavorting in my backyard treehouse, two different tall churches and a variety of rooftops and treetops far and near. I make it a point to look up often and focus briefly on several of these things of varied distances. My eyes are already bad; no need to make them worse. (An aside: Does anyone else wish we could add pics to these comments? I’m positive you are all longing to see my cavorting squirrel pics!)