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Thanks Kempie - I didn't mean to be too specific about the legal requirement for driving, as I don't know what it is......I just used the term 20/20 vision as it's well known and would assume that whenever my eyes are tested, they meet this at least. But I don't understand why they're telling me I'm -0.50 when only something stronger will take my eyesight back to what it was. For example, I used to be able to read a clock on the wall of another office but I no longer can - even with my new specs! Apparently, it's okay because 'most people wouldn't have such good vision anyway'...that's pants.
Anyway, sorry to go on but.....eye strain? What's the worst possible effects of eye strain? Could it make my eyes worse? Headaches maybe?