Seating is roughly as follows depending on what chair you sit in (they will be in a curved configuration in both rows). The first row of seating is back roughly 12-13 feet while the second row is about 14-16 feet back. The picture does look deceiving. From the screen to the back edge of the riser is about 21 feet.

Sitting in the folding chairs at those above distances so far seems natural and not straining on the eyes.