Those dots disappear and reappear as your eye jitters ... There’s also another thing that could be going on. If you look at the grid pattern closely, you might be able to see faint white squares ...

An Amsler grid, also known as ... straight lines in a grid pattern. The lines form very small squares that measure 5 millimeters on each side. There’s a dot to mark the center.

Get enough dots together and your faulty eyeballs start seeing things. With random dot patterns, a simple move of the dots by a few degrees can create trippy concentric circles or wild swirls that ...