Thanks a lot Hesla for your help, greatly appreciated. I went back to the Optician and he did make an adjustment to my glasses. I can move my head a bit more now without affecting my vision but its not perfect.
With my old glasses, this problem didn't really exist although it was almost the same prescription (-5.00) and I did mention this to the Optician. He said it was due its shape, which is oval. New glasses are rectangle shaped but they are not very large glasses. The Optician also said its common for this to happen with people who have high prescription like me (-5.25).
Based on my research I think its due to the fact its 1.67 index glasses, if I knew this I wouldn't have gotten 1.67 index glasses. However, I remember asking one of the employees (a student Optician) if there any disadvantages between 1.67 and 1.6, and he said no.
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