Around 2001, when I was working for the software company, my employer had a job for me in central Manchester which required me to stay over during the week. As it happens, my younger sister and her family lived in nearby Preston. One evening, after work, I popped in to see them. On my way back to my hotel in Manchester, I found that I was unable to actually see the road signs indicating which junction off the orbital M60 motorway to come off. In fact, they were dazzling bright and I realised I could not focus as everything was a blur! This was very frightening