Notice the special boards with dark squares indented below the light ones to guide where to place the pieces.
Also the clock - it has no glass, they set it up and check the status by touch.
Many remember Anatoliy Grupin (not in the picture), the blind Ukrainian player from Los Angeles, who won a couple of APCA divisions.
I played blitz !!! with him many times, most of the times he anticipated my moves and would just check the spots after hearing me move.