Thanks for all your advice guys.
Since I've emigrated from the UK my old specs are in a box somewhere over there, or it wouldn't be much of an issue.
I went to an optometrist who is also a DAO who said I would be all good for eyesight. Just frustrating that I will have to wait for an extra pair of glasses before I can do my medical.
Looking at ordering some transitions but I called Avmed today who said CASA don't like them because they "don't adjust quickly enough to light conditions". Surely they adjust quicker than taking one pair of glasses off and putting another set on?! I've also seen some topics with pilots discussing them and having good success. Perhaps another conversation with the DAO is in order.