"A red circle is moving back and forth above the letters A and B."

"The letters A and B appear in the middle of the screen. A red oval flashes above the A and reappears above the B. Then it moves in the opposite direction. Again and Again."

"The red dot is at rest over the letter 'A'. It then moves to my right and is over the letter 'B' Actually, it kind of disappears and reappears over the 'B'.

"I see a red circle shifting position back and forth between A and B positions at a regular speed. I also see a faint after image.

"If I follow the red ball, it just looks like a blinking light. If I stare at one spot, I see a continuum back and forth."

"Two circles moving between points A and B."

"One red circle is moving between A and B."

"There is a motion of a red dot moving from point A to B to A..."

"There is a red dot flashing between the letters A and B."

"A red circle appeared over the letter 'A' and then upon disappearing, a red circle appeared above the letter 'B'. The dot alternated appearances over the letters several times."