Well that's a terrible quality monitor, so I don't doubt it. It could also be a problem with the cable.
And Mega is right, when your screen is bright and then you look at something dark then your eyes need to re-adjust, it's just like when you're outside in the sun all day and then you go inside, the bright light inside seems dark compared to the even brighter light outdoors. It's not a problem with your eyes, it happens to everybody.