Most bottles that have this similar shape do cause you to see very strangely.  Usually there are all of those blurry spots around the edge of your vision.  Instead of making you see less, this bottle makes you see more.  It flashes all sorts of bright shiny colors for your amusement.  It flashes through 7 different colors total.  You can purchase it for £26.99 or about $40 through Amazon.

Source: Bookofjoe