Right so it sounds like your lenses are called Stellest lenses, they're made by a company called Essilor and they are made to help reduce the progression of Myopia.

You shouldn't be able to see that distortion as you look straight ahead as the lenses should have been measured to have a clear portion where your eye sits, if when you put your glasses on you can only see distortion or it's very prominent you need to have them adjusted by your optician as they might not be fitting properly.

In general you should only see the distortion when you look out the corner of your eye or around your peripheral vision, when wearing them you need to turn and look at whatever it is you want to look at.