Baseball cap, or visor. Sunglasses.
Allow the guy looking in from the side to take the overhead, as a forehand volley or high bounced groundstroke.
Smart teams like to lob into the sun, so you can't see the decending ball. You usually can spot the ball up to it's zenith, then disappears on it's way down.
The only other shot is to line up for the overhead, but tap it back 10' over the net and safely soft enough to illicit a passing shot, not another lob.