Erik Powell's Eyes

Erik Powell is the name of the victim whose body Windom Earle leaves in Sheriff Truman's office for Agent Cooper in episode 20 (Checkmate, 2.013). Mr. Powell is portrayed by Kyle MacLachlan's brother, Craig MacLachlan.

Note that when Powell's body is first found, his right eye is white, and greatly resembles that of a doppelganger's eyes.

When we return to his body in the opening of the continuing episode (episode 21, 2.014, Double Play) Powell's eyes appear to be of a dark hue when viewed in close-shots. 

However, from a distance, we can see that his right eye is still white. His eyes move from looking straight to being crossed. 

In episode 22 (2.015, Slaves and Monsters), we see a photograph of Erik when he was still living. One eye appears to be white in the image as well. Perhaps Mr. Powell was blind in his right eye. If so, blindness in one eye is reminiscent of Nadine Hurley's blindness as well, though it is her left eye rather than her right.