Wow, I guess I'm not the only one. I recently took 2 shot glasses of sheep drench (out of desperation to start expelling these damn worms) and had a very odd vision reaction as well. The best way I can describe it is that it felt like a strobe light kept flickering without any actual light flickering. Even in the day time. And I had the same white shadowy movement feeling, as the other person above described, when I closed my eyes at night. Luckily my vision was back to normal when I woke up. I've given up on Ivermectin, as it didn't do a thing to the worms. Before this double shot (as in shot glass) dose, I have taken a shot daily, 3 days in a row which also produced no effect. Lately I have been feeling a small wriggling feeling behind my eye which is equally disgusting and frustrating as there is nothing you can do about it. I keep having the urge to swat at my face or dig my finger behind my eye to get at it, but can't! This whole worm thing is just a nightmare.