Possible Clues:

• Is able to get this mostly from the corner of one's eyes
• Viewers' angles taken on board by American thinkers
• An itch somehow out of corner of one's eyes
• Capable of making hit out of corner of one's eyes
• Where eyelids join, unable to offer greeting
• Capable of making hit from the corner of one's eyes
• Cannot greeting come from the corners of the eyes?
• Corners of the eyes