Yes. At the moment. Beware though that more and more graduate entry courses are taking A-Levels into account (as they courses are heavily over subscribed - average of 60 applicants per place, which can only rise now that graduates have to pay £3k a year upfront to do 5 year medicine)
As I said, graduate entry is a lot more competative than school leaver entry, so ask yourself would you be happy being an optometrist. If the answer is yes, then go for it. If you're just doing optometry because you think you will then walk into med school after, I would do a little more research on the subject...