You are right to be concerned about night vision after surgery. I had my eyes done at the Derby clinic about 4 years ago. My prescription was _9 in the left eye and -11 in the right one. My eyesight is now -0.75 in the right one and -0.50 in the left one. I am however really worried about how poor my eyes go at night. I couldn't think about watching TV without my glasses and to drive at night without them would be suicide. In saying that, it was the best £3000 I have ever spent.